GoodWe ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 error codes explained

A problem was detected with a connected generator input (voltage, frequency, wiring or start-up).

What you can do

• Check the generator itself (fuel, its own alarms)
• Call us to check the generator integration

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

A problem was detected with a connected generator input (voltage, frequency, wiring or start-up).

What you can do

• Check the generator itself (fuel, its own alarms)
• Call us to check the generator integration

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter has detected an AC wiring problem, for example active and neutral swapped or a connection made the wrong way round.

What you can do

• Do not touch any wiring
• Leave the system as it is and book a licensed electrician (or call us)

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter is running too hot, so it has reduced output or paused to protect itself.

What you can do

• Make sure nothing is stacked against or in front of the inverter, and leave the manufacturer's clearances around it
• Gently clear dust or leaves from the outside of the vents, without opening the unit or spraying water
• Let it cool. It normally resumes by itself
• If it keeps happening on mild days, call us

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The DC voltage coming from the solar panels is higher than the inverter is rated for. Over-voltage can damage the inverter.

What you can do

• Do not touch the DC isolator or cables unless the manufacturer's owner shutdown tells you to
• Call us. The string design needs to be checked by a licensed installer

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

A problem was detected with a connected generator input (voltage, frequency, wiring or start-up).

What you can do

• Check the generator itself (fuel, its own alarms)
• Call us to check the generator integration

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter's arc-fault detection has picked up a pattern that looks like electrical arcing on the DC (solar) side, which can be a fire risk. The inverter shuts down DC power flow as a precaution.

What you can do

• Do not reset it repeatedly and do not touch DC cables or isolators
• If you see smoke or flames or smell burning, keep clear and call 000
• Call us or a licensed electrician to inspect the DC wiring before the system is restarted

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter saw something abnormal about the grid supply (for example phase loss, imbalance, waveform distortion or loss of mains), so it disconnected as a safety measure.

What you can do

• Check whether you have a partial power outage (some circuits or phases off)
• Wait for automatic reconnection after the grid returns to normal
• If it persists or started after electrical work, call us

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter saw something abnormal about the grid supply (for example phase loss, imbalance, waveform distortion or loss of mains), so it disconnected as a safety measure.

What you can do

• Check whether you have a partial power outage (some circuits or phases off)
• Wait for automatic reconnection after the grid returns to normal
• If it persists or started after electrical work, call us

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter saw something abnormal about the grid supply (for example phase loss, imbalance, waveform distortion or loss of mains), so it disconnected as a safety measure.

What you can do

• Check whether you have a partial power outage (some circuits or phases off)
• Wait for automatic reconnection after the grid returns to normal
• If it persists or started after electrical work, call us

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter saw something abnormal about the grid supply (for example phase loss, imbalance, waveform distortion or loss of mains), so it disconnected as a safety measure.

What you can do

• Check whether you have a partial power outage (some circuits or phases off)
• Wait for automatic reconnection after the grid returns to normal
• If it persists or started after electrical work, call us

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter saw something abnormal about the grid supply (for example phase loss, imbalance, waveform distortion or loss of mains), so it disconnected as a safety measure.

What you can do

• Check whether you have a partial power outage (some circuits or phases off)
• Wait for automatic reconnection after the grid returns to normal
• If it persists or started after electrical work, call us

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter saw something abnormal about the grid supply (for example phase loss, imbalance, waveform distortion or loss of mains), so it disconnected as a safety measure.

What you can do

• Check whether you have a partial power outage (some circuits or phases off)
• Wait for automatic reconnection after the grid returns to normal
• If it persists or started after electrical work, call us

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter detected a problem with the earth (protective earth/PE) or with the neutral-to-earth connection. A sound earth is essential for electrical safety.

What you can do

• Do not touch the inverter, frames or cabling
• Leave the system off if it has shut down. Call a licensed electrician or us to test the earthing

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter detected too much DC current in its AC output, which the grid standards don't allow, so it disconnected.

What you can do

• If it happened once and the system recovered, keep an eye on it
• If it repeats, call us

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter detected too much DC current in its AC output, which the grid standards don't allow, so it disconnected.

What you can do

• If it happened once and the system recovered, keep an eye on it
• If it repeats, call us

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter measured leakage (residual) current flowing to earth above its safety limit and disconnected. This can indicate damaged insulation somewhere in the system.

What you can do

• Don't touch cabling or equipment
• If it happens repeatedly, or together with an insulation/isolation alarm, call an electrician or us promptly

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter's arc-fault detection has picked up a pattern that looks like electrical arcing on the DC (solar) side, which can be a fire risk. The inverter shuts down DC power flow as a precaution.

What you can do

• Do not reset it repeatedly and do not touch DC cables or isolators
• If you see smoke or flames or smell burning, keep clear and call 000
• Call us or a licensed electrician to inspect the DC wiring before the system is restarted

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

A monitoring or communication accessory (Wi-Fi/4G/data logger, display or clock) is reporting a problem. This usually doesn't stop the system generating.

What you can do

• Restart your home router and check it reaches the inverter location
• If you changed router or Wi-Fi password, the dongle needs reconfiguring (see the manufacturer's app guide or ask us)
• If generation looks normal but the alarm persists, call us

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The backup/EPS (off-grid) output is overloaded or abnormal, so the system has limited or switched off backup power.

What you can do

• Switch off large appliances on backup circuits
• Wait for the system to retry (some models lock out for a period after repeated overloads)
• If it trips with only small loads on, or you suspect a short circuit, call an electrician

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The backup/EPS (off-grid) output is overloaded or abnormal, so the system has limited or switched off backup power.

What you can do

• Switch off large appliances on backup circuits
• Wait for the system to retry (some models lock out for a period after repeated overloads)
• If it trips with only small loads on, or you suspect a short circuit, call an electrician

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter isn't getting correct readings from its energy meter or current sensor (CT). This affects export limiting, battery charging and monitoring accuracy.

What you can do

• Check the app. Generation may still be running normally
• Don't open the switchboard
• Call us to check the meter/CT wiring. If your system has an export limit, this needs fixing promptly

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The backup/EPS (off-grid) output is overloaded or abnormal, so the system has limited or switched off backup power.

What you can do

• Switch off large appliances on backup circuits
• Wait for the system to retry (some models lock out for a period after repeated overloads)
• If it trips with only small loads on, or you suspect a short circuit, call an electrician

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter is running too hot, so it has reduced output or paused to protect itself.

What you can do

• Make sure nothing is stacked against or in front of the inverter, and leave the manufacturer's clearances around it
• Gently clear dust or leaves from the outside of the vents, without opening the unit or spraying water
• Let it cool. It normally resumes by itself
• If it keeps happening on mild days, call us

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter is running too hot, so it has reduced output or paused to protect itself.

What you can do

• Make sure nothing is stacked against or in front of the inverter, and leave the manufacturer's clearances around it
• Gently clear dust or leaves from the outside of the vents, without opening the unit or spraying water
• Let it cool. It normally resumes by itself
• If it keeps happening on mild days, call us

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter is running too hot, so it has reduced output or paused to protect itself.

What you can do

• Make sure nothing is stacked against or in front of the inverter, and leave the manufacturer's clearances around it
• Gently clear dust or leaves from the outside of the vents, without opening the unit or spraying water
• Let it cool. It normally resumes by itself
• If it keeps happening on mild days, call us

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter is running too hot, so it has reduced output or paused to protect itself.

What you can do

• Make sure nothing is stacked against or in front of the inverter, and leave the manufacturer's clearances around it
• Gently clear dust or leaves from the outside of the vents, without opening the unit or spraying water
• Let it cool. It normally resumes by itself
• If it keeps happening on mild days, call us

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

There is a firmware, model or configuration mismatch between parts of the system, so it can't run normally.

What you can do

• Don't try to reflash firmware yourself unless the manufacturer's app tells you to and it's an owner function
• Call us. We can arrange a firmware update or reconfiguration with the manufacturer

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

There is a firmware, model or configuration mismatch between parts of the system, so it can't run normally.

What you can do

• Don't try to reflash firmware yourself unless the manufacturer's app tells you to and it's an owner function
• Call us. We can arrange a firmware update or reconfiguration with the manufacturer

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The battery management system has reported a problem with battery voltage, current, cells or internal hardware and has limited or stopped battery operation.

What you can do

• Do not open the battery or touch its terminals
• Note the exact alarm text and time from the app
• Call us. Battery faults should be handled by the installer or manufacturer

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The battery management system has reported a problem with battery voltage, current, cells or internal hardware and has limited or stopped battery operation.

What you can do

• Do not open the battery or touch its terminals
• Note the exact alarm text and time from the app
• Call us. Battery faults should be handled by the installer or manufacturer

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The battery management system has reported a problem with battery voltage, current, cells or internal hardware and has limited or stopped battery operation.

What you can do

• Do not open the battery or touch its terminals
• Note the exact alarm text and time from the app
• Call us. Battery faults should be handled by the installer or manufacturer

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The battery management system has reported a problem with battery voltage, current, cells or internal hardware and has limited or stopped battery operation.

What you can do

• Do not open the battery or touch its terminals
• Note the exact alarm text and time from the app
• Call us. Battery faults should be handled by the installer or manufacturer

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The battery management system has reported a problem with battery voltage, current, cells or internal hardware and has limited or stopped battery operation.

What you can do

• Do not open the battery or touch its terminals
• Note the exact alarm text and time from the app
• Call us. Battery faults should be handled by the installer or manufacturer

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The battery management system has reported a problem with battery voltage, current, cells or internal hardware and has limited or stopped battery operation.

What you can do

• Do not open the battery or touch its terminals
• Note the exact alarm text and time from the app
• Call us. Battery faults should be handled by the installer or manufacturer

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter has stopped or limited export to stay within the export limit set for your site, usually because meter readings dropped out or power briefly flowed the wrong way.

What you can do

• Check the app. Generation may still be running normally
• Don't open the switchboard
• Call us to check the meter/CT wiring. If your system has an export limit, this needs fixing promptly

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The backup/EPS (off-grid) output is overloaded or abnormal, so the system has limited or switched off backup power.

What you can do

• Switch off large appliances on backup circuits
• Wait for the system to retry (some models lock out for a period after repeated overloads)
• If it trips with only small loads on, or you suspect a short circuit, call an electrician

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The backup/EPS (off-grid) output is overloaded or abnormal, so the system has limited or switched off backup power.

What you can do

• Switch off large appliances on backup circuits
• Wait for the system to retry (some models lock out for a period after repeated overloads)
• If it trips with only small loads on, or you suspect a short circuit, call an electrician

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The backup/EPS (off-grid) output is overloaded or abnormal, so the system has limited or switched off backup power.

What you can do

• Switch off large appliances on backup circuits
• Wait for the system to retry (some models lock out for a period after repeated overloads)
• If it trips with only small loads on, or you suspect a short circuit, call an electrician

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

There is a firmware, model or configuration mismatch between parts of the system, so it can't run normally.

What you can do

• Don't try to reflash firmware yourself unless the manufacturer's app tells you to and it's an owner function
• Call us. We can arrange a firmware update or reconfiguration with the manufacturer

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The battery management system has reported a problem with battery voltage, current, cells or internal hardware and has limited or stopped battery operation.

What you can do

• Do not open the battery or touch its terminals
• Note the exact alarm text and time from the app
• Call us. Battery faults should be handled by the installer or manufacturer

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The battery management system has reported a problem with battery voltage, current, cells or internal hardware and has limited or stopped battery operation.

What you can do

• Do not open the battery or touch its terminals
• Note the exact alarm text and time from the app
• Call us. Battery faults should be handled by the installer or manufacturer

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The battery management system has reported a problem with battery voltage, current, cells or internal hardware and has limited or stopped battery operation.

What you can do

• Do not open the battery or touch its terminals
• Note the exact alarm text and time from the app
• Call us. Battery faults should be handled by the installer or manufacturer

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The battery (or one of its internal parts) is above its safe temperature, so charging or discharging is limited or stopped to protect it.

What you can do

• Keep clear and do not open or touch the battery
• If you notice smoke, a burning or chemical smell, hissing, swelling or leaking, leave the area, keep others away and call 000
• Otherwise, make sure the space around the battery is clear and shaded, and call us or a licensed electrician to check it

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter temperature is below its operating range.

What you can do

• Wait for temperatures to rise. It should recover by itself
• If it persists in normal weather, call us

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

A surge protection device (SPD) inside or connected to the inverter is reporting a fault, often after a lightning storm or grid surge.

What you can do

• Don't open the inverter
• Call us. SPDs must be replaced by a licensed electrician

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

A surge protection device (SPD) inside or connected to the inverter is reporting a fault, often after a lightning storm or grid surge.

What you can do

• Don't open the inverter
• Call us. SPDs must be replaced by a licensed electrician

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

A cooling fan isn't working properly, which can make the unit run hot and reduce output.

What you can do

• From outside, check that nothing is blocking the vents
• Don't open the unit
• Call us to arrange a fan check or replacement

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

A cooling fan isn't working properly, which can make the unit run hot and reduce output.

What you can do

• From outside, check that nothing is blocking the vents
• Don't open the unit
• Call us to arrange a fan check or replacement

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The system has received a shutdown or control signal, or a protective input has been triggered (for example an emergency stop, demand response or external switch).

What you can do

• Check whether anyone operated an emergency stop or shutdown switch on purpose
• If so, follow the manual to release it only when it is safe
• If nobody did, call us

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter isn't getting correct readings from its energy meter or current sensor (CT). This affects export limiting, battery charging and monitoring accuracy.

What you can do

• Check the app. Generation may still be running normally
• Don't open the switchboard
• Call us to check the meter/CT wiring. If your system has an export limit, this needs fixing promptly

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

One solar string is behaving differently from the others (lower output or current flowing the wrong way), which often points to a panel, connector or configuration issue.

What you can do

• From the ground, check for new shading (trees, new structures) or obvious debris
• Compare string readings in your monitoring app if available
• Book a service check if it continues

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

One solar string is behaving differently from the others (lower output or current flowing the wrong way), which often points to a panel, connector or configuration issue.

What you can do

• From the ground, check for new shading (trees, new structures) or obvious debris
• Compare string readings in your monitoring app if available
• Book a service check if it continues

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter isn't getting correct readings from its energy meter or current sensor (CT). This affects export limiting, battery charging and monitoring accuracy.

What you can do

• Check the app. Generation may still be running normally
• Don't open the switchboard
• Call us to check the meter/CT wiring. If your system has an export limit, this needs fixing promptly

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter isn't getting correct readings from its energy meter or current sensor (CT). This affects export limiting, battery charging and monitoring accuracy.

What you can do

• Check the app. Generation may still be running normally
• Don't open the switchboard
• Call us to check the meter/CT wiring. If your system has an export limit, this needs fixing promptly

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter detected a problem with the earth (protective earth/PE) or with the neutral-to-earth connection. A sound earth is essential for electrical safety.

What you can do

• Do not touch the inverter, frames or cabling
• Leave the system off if it has shut down. Call a licensed electrician or us to test the earthing

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter is running too hot, so it has reduced output or paused to protect itself.

What you can do

• Make sure nothing is stacked against or in front of the inverter, and leave the manufacturer's clearances around it
• Gently clear dust or leaves from the outside of the vents, without opening the unit or spraying water
• Let it cool. It normally resumes by itself
• If it keeps happening on mild days, call us

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter is running too hot, so it has reduced output or paused to protect itself.

What you can do

• Make sure nothing is stacked against or in front of the inverter, and leave the manufacturer's clearances around it
• Gently clear dust or leaves from the outside of the vents, without opening the unit or spraying water
• Let it cool. It normally resumes by itself
• If it keeps happening on mild days, call us

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter is running too hot, so it has reduced output or paused to protect itself.

What you can do

• Make sure nothing is stacked against or in front of the inverter, and leave the manufacturer's clearances around it
• Gently clear dust or leaves from the outside of the vents, without opening the unit or spraying water
• Let it cool. It normally resumes by itself
• If it keeps happening on mild days, call us

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

A solar string or the battery appears to be connected with positive and negative swapped.

What you can do

• Do not touch any DC wiring
• Call us or a licensed electrician

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The battery management system has reported a problem with battery voltage, current, cells or internal hardware and has limited or stopped battery operation.

What you can do

• Do not open the battery or touch its terminals
• Note the exact alarm text and time from the app
• Call us. Battery faults should be handled by the installer or manufacturer

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The battery management system has reported a problem with battery voltage, current, cells or internal hardware and has limited or stopped battery operation.

What you can do

• Do not open the battery or touch its terminals
• Note the exact alarm text and time from the app
• Call us. Battery faults should be handled by the installer or manufacturer

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The battery's state of charge or voltage is low, so the system has stopped discharging it to protect the cells.

What you can do

• Allow it to recharge from solar (or the grid, if your settings allow)
• Check the app for other alarms that could be stopping charging
• If it stays low for days in good sun, call us. Batteries left flat for long periods can be damaged

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The battery management system has reported a problem with battery voltage, current, cells or internal hardware and has limited or stopped battery operation.

What you can do

• Do not open the battery or touch its terminals
• Note the exact alarm text and time from the app
• Call us. Battery faults should be handled by the installer or manufacturer

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The battery management system has reported a problem with battery voltage, current, cells or internal hardware and has limited or stopped battery operation.

What you can do

• Do not open the battery or touch its terminals
• Note the exact alarm text and time from the app
• Call us. Battery faults should be handled by the installer or manufacturer

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter measured low insulation resistance between the solar/battery DC circuits and earth. In Australia this is treated as an earth fault alarm, and the system must be checked by a licensed electrician.

What you can do

• Do not touch panels, DC cables, rooftop isolators or the inverter's DC connectors
• If it clears by itself after the weather dries out, still report it, because repeated alarms point to a developing fault
• Book an electrician or call us. An insulation test needs specialist equipment
• If you see smoke, burn marks or smell burning, keep clear and call 000

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The backup/EPS (off-grid) output is overloaded or abnormal, so the system has limited or switched off backup power.

What you can do

• Switch off large appliances on backup circuits
• Wait for the system to retry (some models lock out for a period after repeated overloads)
• If it trips with only small loads on, or you suspect a short circuit, call an electrician

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The system has stopped and is waiting for a manual reset. GoodWe gives no further detail in the manual, so treat it as needing a service check.

What you can do

• Note the time and any other alarms in the app
• Call us to arrange a check

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

A problem was detected with a connected generator input (voltage, frequency, wiring or start-up).

What you can do

• Check the generator itself (fuel, its own alarms)
• Call us to check the generator integration

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The equipment's self-checks found an internal problem (for example relays, measuring circuits, internal communication or power electronics). Some of these clear by themselves after a one-off event, but repeated alarms usually need a technician.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The backup/EPS (off-grid) output is overloaded or abnormal, so the system has limited or switched off backup power.

What you can do

• Switch off large appliances on backup circuits
• Wait for the system to retry (some models lock out for a period after repeated overloads)
• If it trips with only small loads on, or you suspect a short circuit, call an electrician

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter saw something abnormal about the grid supply (for example phase loss, imbalance, waveform distortion or loss of mains), so it disconnected as a safety measure.

What you can do

• Check whether you have a partial power outage (some circuits or phases off)
• Wait for automatic reconnection after the grid returns to normal
• If it persists or started after electrical work, call us

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter saw something abnormal about the grid supply (for example phase loss, imbalance, waveform distortion or loss of mains), so it disconnected as a safety measure.

What you can do

• Check whether you have a partial power outage (some circuits or phases off)
• Wait for automatic reconnection after the grid returns to normal
• If it persists or started after electrical work, call us

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The rate of change of the grid voltage phase was outside what your local grid standard allows, so the inverter disconnected.

What you can do

• Check whether you have a partial power outage (some circuits or phases off)
• Wait for automatic reconnection after the grid returns to normal
• If it persists or started after electrical work, call us

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

A solar string or the battery appears to be connected with positive and negative swapped.

What you can do

• Do not touch any DC wiring
• Call us or a licensed electrician

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

Current on one or more solar strings is above the limit, or the string current sensor is reading abnormally.

What you can do

• Note the code, time and whether it clears by itself
• If your installer showed you the owner shutdown/restart procedure from the manufacturer's manual (summarised at the top of this page), you may restart the system once. Do not open covers or touch cabling.
• If the code returns or the system stays offline, call us. Internal faults are a warranty/technician job

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter sees no input from a string, and GoodWe points to an open string fuse (on models with string fuses).

What you can do

• From the ground, check for new shading (trees, new structures) or obvious debris
• Compare string readings in your monitoring app if available
• Book a service check if it continues

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter has a record that a string was connected with reversed polarity at some point, which caused the trip switch to operate. A technician needs to check the string before the warning is cleared in the app.

What you can do

• Do not touch any DC wiring
• Call us or a licensed electrician

ET/BT G20 hybrid (ESA) incl. GW9.999K-ETA-G20 · Guide only. All work must be done by a licensed electrician. Get help with this code