Alpha ESS error codes explained

The battery has stopped running, for example because of a shutdown command or because the battery is in protection.

What you can do

• Check the app for other battery alarms
• Call us if it doesn't resume

SMILE5 hybrid inverter (SMILE5-INV) · 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

SMILE5 hybrid inverter (SMILE5-INV) · 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

SMILE5 hybrid inverter (SMILE5-INV) · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter cannot see a normal mains supply, so it has stopped exporting to the grid (and a hybrid system may switch to backup).

What you can do

• Check whether the rest of the house (or your neighbours) has power, and check your network operator's outage map
• Check the switchboard for a tripped solar supply main switch or inverter breaker. Only reset it once. If it trips again, leave it off and call an electrician
• Wait. Once normal grid power is back, the inverter normally reconnects by itself after its safety checks (often a few minutes)
• If grid power is normal but the alarm stays, call us

SMILE5 hybrid inverter (SMILE5-INV) · Guide only. All work must be done by a licensed electrician. Get help with this code

The mains voltage the inverter measured was outside the limits allowed for your network, so it disconnected or reduced output to protect the grid. This is usually a grid condition, not a faulty inverter.

What you can do

• Wait. The inverter reconnects by itself once voltage is back within limits
• Note the time of day it happens. If it happens most sunny days, tell us, because it may need a voltage check or a report to your network operator
• Don't try to change grid protection settings yourself. In Australia they are set to AS/NZS 4777.2 and your network operator's requirements

SMILE5 hybrid inverter (SMILE5-INV) · Guide only. All work must be done by a licensed electrician. Get help with this code

Grid frequency moved outside the allowed range, so the inverter disconnected or reduced output as the standards require.

What you can do

• Wait for automatic reconnection
• If it happens often, record the times and contact us

SMILE5 hybrid inverter (SMILE5-INV) · Guide only. All work must be done by a licensed electrician. Get help with this code

The mains voltage the inverter measured was outside the limits allowed for your network, so it disconnected or reduced output to protect the grid. This is usually a grid condition, not a faulty inverter.

What you can do

• Wait. The inverter reconnects by itself once voltage is back within limits
• Note the time of day it happens. If it happens most sunny days, tell us, because it may need a voltage check or a report to your network operator
• Don't try to change grid protection settings yourself. In Australia they are set to AS/NZS 4777.2 and your network operator's requirements

SMILE5 hybrid inverter (SMILE5-INV) · 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)

SMILE5 hybrid inverter (SMILE5-INV) · 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

SMILE5 hybrid inverter (SMILE5-INV) · 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

SMILE5 hybrid inverter (SMILE5-INV) · 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

SMILE5 hybrid inverter (SMILE5-INV) · 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

SMILE5 hybrid inverter (SMILE5-INV) · 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

SMILE5 hybrid inverter (SMILE5-INV) · 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

SMILE5 hybrid inverter (SMILE5-INV) · Guide only. All work must be done by a licensed electrician. Get help with this code

There isn't enough solar power or voltage for the inverter to run. This is normal at dawn, dusk and in heavy cloud.

What you can do

• Check whether it only happens in low light. If so, no action is needed
• From the ground, look for shading or debris. Don't climb on the roof
• If it shows in full sun, call us

SMILE5 hybrid inverter (SMILE5-INV) · Guide only. All work must be done by a licensed electrician. Get help with this code

There isn't enough solar power or voltage for the inverter to run. This is normal at dawn, dusk and in heavy cloud.

What you can do

• Check whether it only happens in low light. If so, no action is needed
• From the ground, look for shading or debris. Don't climb on the roof
• If it shows in full sun, call us

SMILE5 hybrid inverter (SMILE5-INV) · Guide only. All work must be done by a licensed electrician. Get help with this code

Input power is being limited. Alpha ESS says this is normal in low light.

What you can do

• No action needed in low light

SMILE5 hybrid inverter (SMILE5-INV) · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter's output power is being limited.

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

SMILE5 hybrid inverter (SMILE5-INV) · 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

SMILE5 hybrid inverter (SMILE5-INV) · 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

• This is a protection state, and the battery usually recovers automatically once conditions return to normal
• Reduce heavy loads if it relates to over-current
• If it stays in protection for more than a day, call us

SMILE-BAT-5P battery (protection codes, green LED flashing every 3 s) · 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

SMILE-BAT-5P battery (protection codes, green LED flashing every 3 s) · Guide only. All work must be done by a licensed electrician. Get help with this code

The battery is too cold to charge or discharge safely, so it is pausing until it warms up.

What you can do

• Wait for the battery to warm up. Most systems recover automatically
• If it happens often, ask us whether the location or a heating feature (where the model has one) should be reviewed

SMILE-BAT-5P battery (protection codes, green LED flashing every 3 s) · 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

• This is a protection state, and the battery usually recovers automatically once conditions return to normal
• Reduce heavy loads if it relates to over-current
• If it stays in protection for more than a day, call us

SMILE-BAT-5P battery (protection codes, green LED flashing every 3 s) · 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

• This is a protection state, and the battery usually recovers automatically once conditions return to normal
• Reduce heavy loads if it relates to over-current
• If it stays in protection for more than a day, call us

SMILE-BAT-5P battery (protection codes, green LED flashing every 3 s) · 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

• This is a protection state, and the battery usually recovers automatically once conditions return to normal
• Reduce heavy loads if it relates to over-current
• If it stays in protection for more than a day, call us

SMILE-BAT-5P battery (protection codes, green LED flashing every 3 s) · Guide only. All work must be done by a licensed electrician. Get help with this code

One or more cells are below their minimum voltage, so the battery has stopped discharging to protect itself. Alpha ESS notes a special forced-start procedure for this, which should be left to your installer.

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

SMILE-BAT-5P battery (protection codes, green LED flashing every 3 s) · Guide only. All work must be done by a licensed electrician. Get help with this code

The battery is too cold to charge or discharge safely, so it is pausing until it warms up.

What you can do

• Wait for the battery to warm up. Most systems recover automatically
• If it happens often, ask us whether the location or a heating feature (where the model has one) should be reviewed

SMILE-BAT-5P battery (protection codes, green LED flashing every 3 s) · Guide only. All work must be done by a licensed electrician. Get help with this code

The battery has reported an internal hardware error. Alpha ESS says to wait for automatic recovery and to arrange a repair if it doesn't clear.

What you can do

• Wait to see whether it recovers automatically
• If it doesn't, call us to arrange a repair

SMILE-BAT-5P battery (error codes, red LED flashing every 3 s) · Guide only. All work must be done by a licensed electrician. Get help with this code

The battery has reported an internal hardware error. Alpha ESS says to wait for automatic recovery and to arrange a repair if it doesn't clear.

What you can do

• Wait to see whether it recovers automatically
• If it doesn't, call us to arrange a repair

SMILE-BAT-5P battery (error codes, red LED flashing every 3 s) · Guide only. All work must be done by a licensed electrician. Get help with this code

The battery has reported an internal hardware error. Alpha ESS says to wait for automatic recovery and to arrange a repair if it doesn't clear.

What you can do

• Wait to see whether it recovers automatically
• If it doesn't, call us to arrange a repair

SMILE-BAT-5P battery (error codes, red LED flashing every 3 s) · Guide only. All work must be done by a licensed electrician. Get help with this code

The battery's circuit breaker is open (off), so the battery is disconnected.

What you can do

• Don't switch battery breakers yourself unless your installer has shown you the manufacturer's owner procedure
• Call us. A tripped breaker can indicate an underlying fault

SMILE-BAT-5P battery (error codes, red LED flashing every 3 s) · 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

SMILE-BAT-5P battery (error codes, red LED flashing every 3 s) · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter and battery (or parts inside the battery) have stopped talking to each other, so the battery may stop charging or discharging.

What you can do

• Check the battery's indicator lights and your monitoring app for other alarms
• Don't unplug or re-plug cables yourself
• Call us if it does not clear within a few hours

SMILE-BAT-5P battery (error codes, red LED flashing every 3 s) · 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

SMILE-BAT-5P battery (error codes, red LED flashing every 3 s) · Guide only. All work must be done by a licensed electrician. Get help with this code

The inverter and battery (or parts inside the battery) have stopped talking to each other, so the battery may stop charging or discharging.

What you can do

• Check the battery's indicator lights and your monitoring app for other alarms
• Don't unplug or re-plug cables yourself
• Call us if it does not clear within a few hours

SMILE-BAT-5P battery (error codes, red LED flashing every 3 s) · 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

SMILE-BAT-5P battery (error codes, red LED flashing every 3 s) · 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

SMILE-BAT-5P battery (error codes, red LED flashing every 3 s) · Guide only. All work must be done by a licensed electrician. Get help with this code

The battery's switching transistors (MOS) are too hot. Alpha ESS lets the battery cool for 30–40 minutes before restarting.

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

SMILE-BAT-5P battery (error codes, red LED flashing every 3 s) · Guide only. All work must be done by a licensed electrician. Get help with this code

Inverter lost

What you can do

• Note the code, date and time and check the monitoring app
• Restart the system once using the owner shutdown/start-up steps in your manual if it allows
• If it comes back, call your installer

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

Grid meter lost

What you can do

• Check whether the rest of your house or street has power, and check your network operator's outage map
• Check the switchboard for a tripped solar/inverter breaker - reset it once only; if it trips again, leave it off and call an electrician
• Once normal power is back the inverter usually reconnects on its own within a few minutes
• If the power is normal but the alarm stays, call your installer

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

PV meter lost

What you can do

• Check the monitoring app for the alarm and whether export/consumption readings look wrong
• Restart your home router if the meter talks over Wi-Fi or LAN
• Call your installer - meter and CT wiring is inside the switchboard and must be checked by a licensed electrician

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

BMS lost

What you can do

• Check the app - the battery may show as offline or with no state of charge
• Restart the system once using the shutdown and start-up steps in your owner's manual (battery last off, first on, unless your manual says otherwise)
• If the alarm comes back, call your installer - battery communication cables must be checked by them

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

Circuit_ Breaker_Open

What you can do

• Note the code, date and time and check the monitoring app
• Restart the system once using the owner shutdown/start-up steps in your manual if it allows
• If it comes back, call your installer

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

Follower_Batter y_ Communicatio n_Lost

What you can do

• Check the app - the battery may show as offline or with no state of charge
• Restart the system once using the shutdown and start-up steps in your owner's manual (battery last off, first on, unless your manual says otherwise)
• If the alarm comes back, call your installer - battery communication cables must be checked by them

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

Host_Battery_C ommunication_ Lost

What you can do

• Check the app - the battery may show as offline or with no state of charge
• Restart the system once using the shutdown and start-up steps in your owner's manual (battery last off, first on, unless your manual says otherwise)
• If the alarm comes back, call your installer - battery communication cables must be checked by them

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

Multi_Host_ error

What you can do

• Note the code, date and time and check the monitoring app
• Restart the system once using the owner shutdown/start-up steps in your manual if it allows
• If it comes back, call your installer

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

Grid_OVP

What you can do

• This is usually caused by the mains supply, not the solar system
• The inverter normally reconnects by itself once grid voltage is back in range
• If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

Grid_UVP

What you can do

• This is usually caused by the mains supply, not the solar system
• The inverter normally reconnects by itself once grid voltage is back in range
• If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

Grid_OFP

What you can do

• This is caused by the mains frequency moving outside the allowed range, usually briefly
• The inverter reconnects by itself once the grid is stable
• If it keeps happening, note the times and call your installer

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

Grid_UFP

What you can do

• This is caused by the mains frequency moving outside the allowed range, usually briefly
• The inverter reconnects by itself once the grid is stable
• If it keeps happening, note the times and call your installer

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

BUS_OVP1

What you can do

• Note the code, then restart the system once using the owner shutdown/start-up steps in your manual
• If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

Insulation_ fault

What you can do

• Do not touch the panels, rooftop isolators or DC cables
• Note the code and whether it appears in wet weather or early morning - this helps the electrician
• If it clears by itself once things dry out, still let us know if it keeps returning
• Call a licensed electrician or Total Solar - insulation and earth faults need testing with proper equipment

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

GFCI_fault

What you can do

• Keep clear and do not touch the inverter or cabling
• Note the code, date and time
• Call a licensed electrician or Total Solar - this alarm means current may be leaking to earth

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

Grid_relay_ fault

What you can do

• Note the code, then restart the system once using the owner shutdown/start-up steps in your manual
• If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

Over_ Temperature

What you can do

• Check from a safe distance that the inverter is shaded, has clear space around it and that nothing is blocking the vents
• It usually recovers once it cools down
• If it repeats often or you can hear a noisy/failed fan, call your installer

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

PV_Reverse

What you can do

• Do not touch the DC isolators, cables or connectors
• Call your installer - this points to a wiring problem that needs a licensed electrician

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

BAT_Reverse

What you can do

• Do not touch the DC isolators, cables or connectors
• Call your installer - this points to a wiring problem that needs a licensed electrician

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

MPPT1_OVP

What you can do

• Do not touch the DC isolators or cables
• Note the time - this often shows on cold, very sunny mornings
• Call your installer - the panel strings may need to be checked against the inverter's limits

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

MPPT2_OVP

What you can do

• Do not touch the DC isolators or cables
• Note the time - this often shows on cold, very sunny mornings
• Call your installer - the panel strings may need to be checked against the inverter's limits

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

BAT_OVP

What you can do

• Note the code and the battery state of charge shown in the app
• Let the system run - some battery voltage protections clear by themselves after charging or discharging
• If the alarm stays or keeps returning, call your installer - don't open or disconnect the battery yourself

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

BAT_UVP

What you can do

• Note the code and the battery state of charge shown in the app
• Let the system run - some battery voltage protections clear by themselves after charging or discharging
• If the alarm stays or keeps returning, call your installer - don't open or disconnect the battery yourself

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

Battery_lose

What you can do

• Check the battery status and any extra alarms in the app
• Restart the system once using the owner shutdown/start-up steps in your manual if it allows
• If the alarm comes back, or the battery is hot, swollen, noisy or smells, keep clear and call your installer

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

Output_short_ circuit

What you can do

• Note the code, date and time and check the monitoring app
• Restart the system once using the owner shutdown/start-up steps in your manual if it allows
• If it comes back, call your installer

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

Output_ overload

What you can do

• Turn off some large appliances (air-conditioners, ovens, kettles, pool pumps) - backup outputs have a power limit
• The system usually recovers by itself once the load drops
• If it keeps happening with normal loads, call your installer

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

Backup_ovp

What you can do

• This is usually caused by the mains supply, not the solar system
• The inverter normally reconnects by itself once grid voltage is back in range
• If it happens often (especially on sunny afternoons), note the times and call your installer - they can check the voltage and settings and talk to the network if needed

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

Para_CAN

What you can do

• Note the code, date and time and check the monitoring app
• Restart the system once using the owner shutdown/start-up steps in your manual if it allows
• If it comes back, call your installer

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

Para_SW_Diff

What you can do

• Note the code, date and time and check the monitoring app
• Restart the system once using the owner shutdown/start-up steps in your manual if it allows
• If it comes back, call your installer

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

Para_Module_ Fault

What you can do

• Note the code, date and time and check the monitoring app
• Restart the system once using the owner shutdown/start-up steps in your manual if it allows
• If it comes back, call your installer

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

Para_Multi_ Host

What you can do

• Note the code, date and time and check the monitoring app
• Restart the system once using the owner shutdown/start-up steps in your manual if it allows
• If it comes back, call your installer

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

EVChargerLos t

What you can do

• Note the code, date and time and check the monitoring app
• Restart the system once using the owner shutdown/start-up steps in your manual if it allows
• If it comes back, call your installer

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

Relay OTP

What you can do

• Check from a safe distance that the inverter is shaded, has clear space around it and that nothing is blocking the vents
• It usually recovers once it cools down
• If it repeats often or you can hear a noisy/failed fan, call your installer

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

Output overload

What you can do

• Turn off some large appliances (air-conditioners, ovens, kettles, pool pumps) - backup outputs have a power limit
• The system usually recovers by itself once the load drops
• If it keeps happening with normal loads, call your installer

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

AC leakage current

What you can do

• Keep clear and do not touch the inverter or cabling
• Note the code, date and time
• Call a licensed electrician or Total Solar - this alarm means current may be leaking to earth

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

Input terminal OTP

What you can do

• Check from a safe distance that the inverter is shaded, has clear space around it and that nothing is blocking the vents
• It usually recovers once it cools down
• If it repeats often or you can hear a noisy/failed fan, call your installer

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

Relay abnormal

What you can do

• Note the code, then restart the system once using the owner shutdown/start-up steps in your manual
• If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

Ground fault

What you can do

• Do not touch the panels, rooftop isolators or DC cables
• Note the code and whether it appears in wet weather or early morning - this helps the electrician
• If it clears by itself once things dry out, still let us know if it keeps returning
• Call a licensed electrician or Total Solar - insulation and earth faults need testing with proper equipment

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

Reverse phase

What you can do

• Do not touch the DC isolators, cables or connectors
• Call your installer - this points to a wiring problem that needs a licensed electrician

SMILE-G3 hybrid system (inverter, battery, accessories) · Guide only. All work must be done by a licensed electrician. Get help with this code

High temperature

What you can do

• Check from a safe distance that the inverter is shaded, has clear space around it and that nothing is blocking the vents
• It usually recovers once it cools down
• If it repeats often or you can hear a noisy/failed fan, call your installer

SMILE-G3 battery (LED protection/error states) · Guide only. All work must be done by a licensed electrician. Get help with this code

Low temperature discharge

What you can do

• This normally means the battery is low or has reached its reserve level
• Let the system recharge from solar or the grid - check the state of charge in the app
• If the battery never charges or stays at 0% for more than a day of sunshine, call your installer

SMILE-G3 battery (LED protection/error states) · Guide only. All work must be done by a licensed electrician. Get help with this code

Overcurrent charge

What you can do

• Turn off any very large loads that were running when the alarm appeared
• Wait - many over-current protections reset automatically
• If it keeps happening, call your installer

SMILE-G3 battery (LED protection/error states) · Guide only. All work must be done by a licensed electrician. Get help with this code

Overcurrent discharge

What you can do

• Turn off any very large loads that were running when the alarm appeared
• Wait - many over-current protections reset automatically
• If it keeps happening, call your installer

SMILE-G3 battery (LED protection/error states) · Guide only. All work must be done by a licensed electrician. Get help with this code

Cell under voltage

What you can do

• Note the code and the battery state of charge shown in the app
• Let the system run - some battery voltage protections clear by themselves after charging or discharging
• If the alarm stays or keeps returning, call your installer - don't open or disconnect the battery yourself

SMILE-G3 battery (LED protection/error states) · Guide only. All work must be done by a licensed electrician. Get help with this code

Low temperature charge

What you can do

• Check from a safe distance that the inverter is shaded, has clear space around it and that nothing is blocking the vents
• It usually recovers once it cools down
• If it repeats often or you can hear a noisy/failed fan, call your installer

SMILE-G3 battery (LED protection/error states) · Guide only. All work must be done by a licensed electrician. Get help with this code

Temperature difference

What you can do

• Check from a safe distance that the inverter is shaded, has clear space around it and that nothing is blocking the vents
• It usually recovers once it cools down
• If it repeats often or you can hear a noisy/failed fan, call your installer

SMILE-G3 battery (LED protection/error states) · Guide only. All work must be done by a licensed electrician. Get help with this code

Cell overvoltage

What you can do

• Note the code and the battery state of charge shown in the app
• Let the system run - some battery voltage protections clear by themselves after charging or discharging
• If the alarm stays or keeps returning, call your installer - don't open or disconnect the battery yourself

SMILE-G3 battery (LED protection/error states) · Guide only. All work must be done by a licensed electrician. Get help with this code

Hardware error

What you can do

• Note the code, then restart the system once using the owner shutdown/start-up steps in your manual
• If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer

SMILE-G3 battery (LED protection/error states) · Guide only. All work must be done by a licensed electrician. Get help with this code

Circuit breaker open

What you can do

• Note the code, date and time and check the monitoring app
• Restart the system once using the owner shutdown/start-up steps in your manual if it allows
• If it comes back, call your installer

SMILE-G3 battery (LED protection/error states) · Guide only. All work must be done by a licensed electrician. Get help with this code

LMU disconnect (follower)

What you can do

• Check the app - the battery may show as offline or with no state of charge
• Restart the system once using the shutdown and start-up steps in your owner's manual (battery last off, first on, unless your manual says otherwise)
• If the alarm comes back, call your installer - battery communication cables must be checked by them

SMILE-G3 battery (LED protection/error states) · Guide only. All work must be done by a licensed electrician. Get help with this code

SN missing

What you can do

• Note the code, date and time and check the monitoring app
• Restart the system once using the owner shutdown/start-up steps in your manual if it allows
• If it comes back, call your installer

SMILE-G3 battery (LED protection/error states) · Guide only. All work must be done by a licensed electrician. Get help with this code

LMU disconnect (host)

What you can do

• Check the app - the battery may show as offline or with no state of charge
• Restart the system once using the shutdown and start-up steps in your owner's manual (battery last off, first on, unless your manual says otherwise)
• If the alarm comes back, call your installer - battery communication cables must be checked by them

SMILE-G3 battery (LED protection/error states) · Guide only. All work must be done by a licensed electrician. Get help with this code

Software version inconsistent

What you can do

• Make sure the system is online so it can receive updates
• Restart the system once using the owner steps in your manual
• If the alarm stays, call your installer - settings and firmware must be fixed by them or the manufacturer

SMILE-G3 battery (LED protection/error states) · Guide only. All work must be done by a licensed electrician. Get help with this code

Multi-host

What you can do

• Note the code, date and time and check the monitoring app
• Restart the system once using the owner shutdown/start-up steps in your manual if it allows
• If it comes back, call your installer

SMILE-G3 battery (LED protection/error states) · Guide only. All work must be done by a licensed electrician. Get help with this code

MOS over temperature

What you can do

• Check from a safe distance that the inverter is shaded, has clear space around it and that nothing is blocking the vents
• It usually recovers once it cools down
• If it repeats often or you can hear a noisy/failed fan, call your installer

SMILE-G3 battery (LED protection/error states) · Guide only. All work must be done by a licensed electrician. Get help with this code

Insulation fault

What you can do

• Do not touch the panels, rooftop isolators or DC cables
• Note the code and whether it appears in wet weather or early morning - this helps the electrician
• If it clears by itself once things dry out, still let us know if it keeps returning
• Call a licensed electrician or Total Solar - insulation and earth faults need testing with proper equipment

SMILE-G3 battery (LED protection/error states) · Guide only. All work must be done by a licensed electrician. Get help with this code

Total voltage fault

What you can do

• Note the code and the battery state of charge shown in the app
• Let the system run - some battery voltage protections clear by themselves after charging or discharging
• If the alarm stays or keeps returning, call your installer - don't open or disconnect the battery yourself

SMILE-G3 battery (LED protection/error states) · Guide only. All work must be done by a licensed electrician. Get help with this code

Precharge failure

What you can do

• Note the code, then restart the system once using the owner shutdown/start-up steps in your manual
• If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer

SMILE-G3 battery (LED protection/error states) · Guide only. All work must be done by a licensed electrician. Get help with this code

High temperature

What you can do

• Check from a safe distance that the inverter is shaded, has clear space around it and that nothing is blocking the vents
• It usually recovers once it cools down
• If it repeats often or you can hear a noisy/failed fan, call your installer

SMILE5 (2023 UK manual) inverter & battery · Guide only. All work must be done by a licensed electrician. Get help with this code

Low-temperature discharge

What you can do

• This normally means the battery is low or has reached its reserve level
• Let the system recharge from solar or the grid - check the state of charge in the app
• If the battery never charges or stays at 0% for more than a day of sunshine, call your installer

SMILE5 (2023 UK manual) inverter & battery · Guide only. All work must be done by a licensed electrician. Get help with this code

Over-current charge

What you can do

• Turn off any very large loads that were running when the alarm appeared
• Wait - many over-current protections reset automatically
• If it keeps happening, call your installer

SMILE5 (2023 UK manual) inverter & battery · Guide only. All work must be done by a licensed electrician. Get help with this code

Over-current discharge

What you can do

• Turn off any very large loads that were running when the alarm appeared
• Wait - many over-current protections reset automatically
• If it keeps happening, call your installer

SMILE5 (2023 UK manual) inverter & battery · Guide only. All work must be done by a licensed electrician. Get help with this code

Cell overvoltage

What you can do

• Note the code and the battery state of charge shown in the app
• Let the system run - some battery voltage protections clear by themselves after charging or discharging
• If the alarm stays or keeps returning, call your installer - don't open or disconnect the battery yourself

SMILE5 (2023 UK manual) inverter & battery · Guide only. All work must be done by a licensed electrician. Get help with this code

Cell under voltage

What you can do

• Note the code and the battery state of charge shown in the app
• Let the system run - some battery voltage protections clear by themselves after charging or discharging
• If the alarm stays or keeps returning, call your installer - don't open or disconnect the battery yourself

SMILE5 (2023 UK manual) inverter & battery · Guide only. All work must be done by a licensed electrician. Get help with this code

Low-temperature charge

What you can do

• Check from a safe distance that the inverter is shaded, has clear space around it and that nothing is blocking the vents
• It usually recovers once it cools down
• If it repeats often or you can hear a noisy/failed fan, call your installer

SMILE5 (2023 UK manual) inverter & battery · Guide only. All work must be done by a licensed electrician. Get help with this code

Hardware error

What you can do

• Note the code, then restart the system once using the owner shutdown/start-up steps in your manual
• If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer

SMILE5 (2023 UK manual) inverter & battery · Guide only. All work must be done by a licensed electrician. Get help with this code

Hardware error

What you can do

• Note the code, then restart the system once using the owner shutdown/start-up steps in your manual
• If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer

SMILE5 (2023 UK manual) inverter & battery · Guide only. All work must be done by a licensed electrician. Get help with this code

Circuit Breaker Open

What you can do

• Note the code, date and time and check the monitoring app
• Restart the system once using the owner shutdown/start-up steps in your manual if it allows
• If it comes back, call your installer

SMILE5 (2023 UK manual) inverter & battery · Guide only. All work must be done by a licensed electrician. Get help with this code

DIP difference

What you can do

• Note the code, date and time and check the monitoring app
• Restart the system once using the owner shutdown/start-up steps in your manual if it allows
• If it comes back, call your installer

SMILE5 (2023 UK manual) inverter & battery · Guide only. All work must be done by a licensed electrician. Get help with this code

Inverter communication lost (SYS red light flashing fast).

What you can do

• Check that your home Wi-Fi/internet is working and restart your router
• Wait an hour - monitoring often reconnects by itself
• If the inverter screen also shows a fault, or the alarm stays for more than a day, call your installer

SMILE-M5 / M3.6-S + SMILE-M-BAT-5P · Guide only. All work must be done by a licensed electrician. Get help with this code

Grid-side meter communication lost (SYS red light on; METER light off or flashing fast).

What you can do

• Check the monitoring app for the alarm and whether export/consumption readings look wrong
• Restart your home router if the meter talks over Wi-Fi or LAN
• Call your installer - meter and CT wiring is inside the switchboard and must be checked by a licensed electrician

SMILE-M5 / M3.6-S + SMILE-M-BAT-5P · Guide only. All work must be done by a licensed electrician. Get help with this code

PV-inverter-side meter communication lost (METER light flashing slow, or off if all meters lost).

What you can do

• Check the monitoring app for the alarm and whether export/consumption readings look wrong
• Restart your home router if the meter talks over Wi-Fi or LAN
• Call your installer - meter and CT wiring is inside the switchboard and must be checked by a licensed electrician

SMILE-M5 / M3.6-S + SMILE-M-BAT-5P · Guide only. All work must be done by a licensed electrician. Get help with this code

Battery management system communication lost (SYS red light on, BAT light off).

What you can do

• Check the app - the battery may show as offline or with no state of charge
• Restart the system once using the shutdown and start-up steps in your owner's manual
• If the alarm comes back, call your installer - battery communication cables must be checked by them

SMILE-M5 / M3.6-S + SMILE-M-BAT-5P · Guide only. All work must be done by a licensed electrician. Get help with this code

A battery circuit breaker is open.

What you can do

• Check the battery status and any extra alarms in the app
• Restart the system once using the owner shutdown/start-up steps in your manual if it allows
• If the alarm comes back, or the battery is hot, swollen, noisy or smells, keep clear, call your installer, and call 000 if there is smoke

SMILE-M5 / M3.6-S + SMILE-M-BAT-5P · Guide only. All work must be done by a licensed electrician. Get help with this code

Communication with a follower (slave) battery has been lost.

What you can do

• Check the app - the battery may show as offline or with no state of charge
• Restart the system once using the shutdown and start-up steps in your owner's manual
• If the alarm comes back, call your installer - battery communication cables must be checked by them

SMILE-M5 / M3.6-S + SMILE-M-BAT-5P · Guide only. All work must be done by a licensed electrician. Get help with this code

Communication with the host (master) battery has been lost.

What you can do

• Check the app - the battery may show as offline or with no state of charge
• Restart the system once using the shutdown and start-up steps in your owner's manual
• If the alarm comes back, call your installer - battery communication cables must be checked by them

SMILE-M5 / M3.6-S + SMILE-M-BAT-5P · Guide only. All work must be done by a licensed electrician. Get help with this code

More than one battery is acting as the master.

What you can do

• Check the battery status and any extra alarms in the app
• Restart the system once using the owner shutdown/start-up steps in your manual if it allows
• If the alarm comes back, or the battery is hot, swollen, noisy or smells, keep clear, call your installer, and call 000 if there is smoke

SMILE-M5 / M3.6-S + SMILE-M-BAT-5P · Guide only. All work must be done by a licensed electrician. Get help with this code

Internal DC bus overvoltage.

What you can do

• Do not touch the DC isolators or cables
• Note the time - this often shows on cold, very sunny mornings
• Call your installer - the panel strings may need to be checked against the inverter's limits

SMILE-M5 / M3.6-S + SMILE-M-BAT-5P · Guide only. All work must be done by a licensed electrician. Get help with this code

Insulation fault on the PV side.

What you can do

• Keep clear - do not touch the panels, rooftop isolators, DC cables or the inverter
• Note the code and whether it appears in wet weather or early morning - this helps the electrician
• If you see smoke, smell burning or hear crackling, keep everyone away and call 000
• Call a licensed electrician or Total Solar - insulation and earth faults need testing with proper equipment

SMILE-M5 / M3.6-S + SMILE-M-BAT-5P · Guide only. All work must be done by a licensed electrician. Get help with this code

Residual (earth leakage) current fault.

What you can do

• Keep clear and do not touch the inverter or cabling
• Note the code, date and time
• If you see smoke, smell burning or hear crackling, keep everyone away and call 000
• Call a licensed electrician or Total Solar - this alarm means current may be leaking to earth

SMILE-M5 / M3.6-S + SMILE-M-BAT-5P · Guide only. All work must be done by a licensed electrician. Get help with this code

Grid relay fault.

What you can do

• Note the code, then restart the system once using the owner shutdown/start-up steps in your manual
• If the code comes back, call your installer - this is an internal fault that needs a licensed electrician or the manufacturer

SMILE-M5 / M3.6-S + SMILE-M-BAT-5P · Guide only. All work must be done by a licensed electrician. Get help with this code

Inverter over temperature.

What you can do

• Check from a safe distance that the inverter is shaded, has clear space around it and that nothing is blocking the vents
• It usually recovers once it cools down
• If it repeats often or you can hear a noisy/failed fan, call your installer

SMILE-M5 / M3.6-S + SMILE-M-BAT-5P · Guide only. All work must be done by a licensed electrician. Get help with this code

PV input connected with reversed polarity.

What you can do

• Keep clear - do not touch the DC isolators, cables or connectors
• If you see smoke, smell burning or hear crackling, keep everyone away and call 000
• Call a licensed electrician or your installer - this points to a wiring problem

SMILE-M5 / M3.6-S + SMILE-M-BAT-5P · Guide only. All work must be done by a licensed electrician. Get help with this code

Battery terminals connected with reversed polarity.

What you can do

• Keep clear - do not touch the battery, its cables or the inverter
• If you see smoke, smell burning or hear crackling, keep everyone away and call 000
• Call a licensed electrician or your installer - battery wiring polarity must be checked before the system is used

SMILE-M5 / M3.6-S + SMILE-M-BAT-5P · Guide only. All work must be done by a licensed electrician. Get help with this code

Battery overvoltage.

What you can do

• Note the code and the battery state of charge shown in the app
• Let the system run - some battery voltage protections clear by themselves after charging or discharging
• If the alarm stays or keeps returning, call your installer - don't open or disconnect the battery yourself

SMILE-M5 / M3.6-S + SMILE-M-BAT-5P · Guide only. All work must be done by a licensed electrician. Get help with this code

Battery undervoltage.

What you can do

• Note the code and the battery state of charge shown in the app
• Let the system run - some battery voltage protections clear by themselves after charging or discharging
• If the alarm stays or keeps returning, call your installer - don't open or disconnect the battery yourself

SMILE-M5 / M3.6-S + SMILE-M-BAT-5P · Guide only. All work must be done by a licensed electrician. Get help with this code

Battery not detected by the inverter.

What you can do

• Check the app - the battery may show as offline or with no state of charge
• Restart the system once using the shutdown and start-up steps in your owner's manual
• If the alarm comes back, call your installer - battery communication cables must be checked by them

SMILE-M5 / M3.6-S + SMILE-M-BAT-5P · Guide only. All work must be done by a licensed electrician. Get help with this code

Short circuit on the backup (off-grid) output.

What you can do

• Keep clear - do not touch the inverter, backup circuits or cabling
• Switch off appliances on backup circuits only if it is safe to do so
• If you see smoke, smell burning or hear crackling, keep everyone away and call 000
• Call a licensed electrician or your installer - a short circuit must be found before the system is reset

SMILE-M5 / M3.6-S + SMILE-M-BAT-5P · Guide only. All work must be done by a licensed electrician. Get help with this code

Backup (off-grid) output overloaded.

What you can do

• Turn off some large appliances (air-conditioners, ovens, kettles, pool pumps) - backup outputs have a power limit
• The system usually recovers by itself once the load drops
• If it keeps happening with normal loads, call your installer

SMILE-M5 / M3.6-S + SMILE-M-BAT-5P · Guide only. All work must be done by a licensed electrician. Get help with this code

Backup output overvoltage.

What you can do

• Note the code, time and whether it clears by itself
• You may restart the system once using the owner shutdown/start-up steps in your manual. Do not open covers or touch cabling
• If the code returns or the system stays offline, call your installer - internal faults are a warranty/technician job

SMILE-M5 / M3.6-S + SMILE-M-BAT-5P · Guide only. All work must be done by a licensed electrician. Get help with this code