Sigenergy SigenStor alarm codes explained

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

Sub-IDs: ID1: The inverter software version does not match; ID2: The inverter software & hardware ver- sion does not match; ID3: The protocol versions among equip- ment do not match

Likely causes:

• Interrupted or partial firmware update
• Parts replaced with different firmware versions
• Incorrect model or country/region setting

What you can safely 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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

What it means: 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.

Likely causes:

• Damaged DC cable insulation (for example from rodents, UV or a pinched cable)
• Water in a DC connector, isolator or junction box
• A damaged solar panel or backsheet
• Heavy dew or rain can trigger it temporarily on marginal systems

What you can safely 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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

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

Likely causes:

• High ambient temperature or direct afternoon sun on the inverter
• Blocked air vents or heat sink (dust, cobwebs, stored items)
• A fan problem (on fan-cooled models)

What you can safely do:

• Check the unit isn't in direct sun and its vents and cover aren't blocked
• Wait. Sigenergy says it restarts once temperatures return to normal
• If it repeats, report it through mySigen (Support > troubleshooting) or call us

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

What it means: 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.

Sub-IDs: ID1: Malfunction of the power module; ID2: Control module fault; ID3: Auxiliary power supply module fault; ID4: Built-in PID module fault; ID5: Monitoring module fault; ID6: Heating film fault; ID7: External fan fault

Likely causes:

• A one-off disturbance (for example a grid event)
• Internal component or circuit board fault
• Firmware issue

What you can safely do:

• Note the code and sub-ID from the mySigen app
• Restart once using the mySigen app (Settings > turn device off/on), the owner method in the SigenStor Home User Manual
• If the code returns, submit it via the app's Support > troubleshooting page or call us

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

What it means: 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.

Likely causes:

• Loose or missing earth connection on the inverter or array
• Neutral and earth problem in the AC wiring or switchboard
• Fault in the building's main earth

What you can safely 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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

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

Sub-IDs: ID1: String 1 input overvoltage; ID2: String 2 input overvoltage; ID3: String 3 input overvoltage; ID4: String 4 input overvoltage; ID5: String 5 input overvoltage; ID6: String 6 input overvoltage; ID7: String 7 input overvoltage; ID8: String 8 input overvoltage; ID9: String 9 input overvoltage; ID10: String 10 input overvoltage; ID11: String 11 input overvoltage; ID12: String 12 input overvoltage; ID13: String 13 input overvoltage; ID14: String 14 input overvoltage; ID15: String 15 input overvoltage; ID16: String 16 input overvoltage

Likely causes:

• Too many panels wired in series in a string (system design/installation issue)
• Very cold, bright mornings raise panel voltage
• Incorrect panel or string configuration after a change to the system

What you can safely 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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

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

Sub-IDs: ID1: String 1 reversely connected; ID2: String 2 reversely connected; ID3: String 3 reversely connected; ID4: String 4 reversely connected; ID5: String 5 reversely connected; ID6: String 6 reversely connected; ID7: String 7 reversely connected; ID8: String 8 reversely connected; ID9: String 9 reversely connected; ID10: String 10 reversely connected; ID11: String 11 reversely connected; ID12: String 12 reversely connected; ID13: String 13 reversely connected; ID14: String 14 reversely connected; ID15: String 15 reversely connected; ID16: String 16 reversely connected

Likely causes:

• Polarity error during installation or maintenance

What you can safely do:

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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

What it means: 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.

Sub-IDs: ID1: String 1 sinking current; ID2: String 2 sinking current; ID3: String 3 sinking current; ID4: String 4 sinking current; ID5: String 5 sinking current; ID6: String 6 sinking current; ID7: String 7 sinking current; ID8: String 8 sinking current; ID9: String 9 sinking current; ID10: String 10 sinking current; ID11: String 11 sinking current; ID12: String 12 sinking current; ID13: String 13 sinking current; ID14: String 14 sinking current; ID15: String 15 sinking current; ID16: String 16 sinking current

Likely causes:

• Shading or heavy dirt on part of the array
• Different panel counts or orientations on strings sharing an input
• Faulty panel, connector or cable

What you can safely 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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

What it means: 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.

Sub-IDs: ID1: AFCI fault of string 1; ID2: AFCI fault of string 2; ID3: AFCI fault of string 3; ID4: AFCI fault of string 4; ID5: AFCI fault of string 5; ID6: AFCI fault of string 6; ID7: AFCI fault of string 7; ID8: AFCI fault of string 8; ID9: AFCI fault of string 9; ID10: AFCI fault of string 10; ID11: AFCI fault of string 11; ID12: AFCI fault of string 12; ID13: AFCI fault of string 13; ID14: AFCI fault of string 14; ID15: AFCI fault of string 15; ID16: AFCI fault of string 16

Likely causes:

• Loose or poorly crimped DC connector
• Damaged DC cable
• Water or corrosion in a DC connector or isolator

What you can safely 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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

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

Likely causes:

• Power outage in your street or area
• A tripped or switched-off solar/inverter circuit breaker in the switchboard
• Loose AC connection between the switchboard and the inverter

What you can safely do:

• Check for a power outage in your area or a tripped breaker in the switchboard
• Sigenergy says the inverter reconnects automatically once the grid is back
• If the grid is fine and it persists, call us

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

What it means: 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.

Sub-IDs: ID1: Grid overvoltage Level I; ID2: Grid overvoltage Level II; ID3: Grid overvoltage Level III

Likely causes:

• High street voltage, common on sunny afternoons when many homes export solar
• Grid disturbances or voltage dips
• Long or undersized AC cabling between the inverter and the switchboard (installation issue)
• Grid protection settings that don't match your network's requirements

What you can safely 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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

What it means: 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.

Sub-IDs: ID1: Grid undervoltage Level I; ID2: Grid undervoltage Level II; ID3: Grid undervoltage Level III

Likely causes:

• High street voltage, common on sunny afternoons when many homes export solar
• Grid disturbances or voltage dips
• Long or undersized AC cabling between the inverter and the switchboard (installation issue)
• Grid protection settings that don't match your network's requirements

What you can safely 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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

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

Sub-IDs: ID1: Grid overfrequency Level I; ID2: Grid overfrequency Level II; ID3: Grid overfrequency Level III

Likely causes:

• Short grid disturbance
• Running on a generator or a weak supply
• Grid settings that don't match the local network

What you can safely do:

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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

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

Sub-IDs: ID1: Grid underfrequency Level I; ID2: Grid underfrequency Level II; ID3: Grid underfrequency Level III

Likely causes:

• Short grid disturbance
• Running on a generator or a weak supply
• Grid settings that don't match the local network

What you can safely do:

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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

What it means: 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.

Likely causes:

• Grid disturbance or partial outage (for example one phase lost on a 3-phase supply)
• Supply problems on the network side
• Wiring or phase-order errors at installation (if it shows up from day one)

What you can safely 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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

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

Likely causes:

• A one-off disturbance (if it is occasional)
• Internal measuring or power stage problem (if it repeats)

What you can safely do:

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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

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

Likely causes:

• Damaged DC or AC cable insulation
• Moisture in connectors or equipment
• A one-off disturbance (if it happens once and never again)

What you can safely do:

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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

What it means: A communication link has dropped. The sub-ID tells you which one: ID1 4G, ID2 internal CAN, ID3 energy meter, ID4 Gateway. A 4G (ID1) alarm is usually just data or signal, while ID2–ID4 point to wiring or connector problems.

Sub-IDs: ID1: 4G communication fault; ID2: CAN communication fault; ID3: Meter communication fault; ID4: Gateway communication fault

Likely causes:

• Insufficient 4G data or no SIM (ID1)
• Loose internal connector or CAN module fault (ID2)
• Meter or Gateway cable/connector problem (ID3/ID4)

What you can safely do:

• Note the sub-ID shown in the mySigen app
• For ID1, check your Sigen 4G data status in the app
• For other IDs, restart from the mySigen app (Settings) once, then use the app's Support > troubleshooting page or call us

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

What it means: 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.

Sub-IDs: ID1: MPPT1 overcurrent protection; ID2: MPPT2 overcurrent protection; ID3: MPPT3 overcurrent protection; ID4: MPPT4 overcurrent protection; ID5: MPPT5 overcurrent protection; ID6: MPPT6 overcurrent protection; ID7: MPPT7 overcurrent protection; ID8: MPPT8 overcurrent protection; ID9: MPPT9 overcurrent protection; ID10: MPPT10 overcurrent protection; ID11: MPPT11 overcurrent protection; ID12: MPPT12 overcurrent protection; ID13: MPPT13 overcurrent protection; ID14: MPPT14 overcurrent protection; ID15: MPPT15 overcurrent protection; ID16: MPPT16 overcurrent protection; ID17: Inverter output overcurrent protection; ID18: BUS overvoltage protection; ID19: Internal BUS voltage imbalance protection; ID20: Internal control protection

Likely causes:

• A one-off disturbance (for example a grid event)
• Internal component or circuit board fault
• Firmware issue

What you can safely do:

• Note the code and sub-ID from the mySigen app
• Restart once using the mySigen app (Settings > turn device off/on), the owner method in the SigenStor Home User Manual
• If the code returns, submit it via the app's Support > troubleshooting page or call us

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

What it means: 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.

Sub-IDs: ID1: AFCI self-checking circuit 1 fault; ID2: AFCI self-checking circuit 2 fault; ID3: AFCI self-checking circuit 3 fault; ID4: AFCI self-checking circuit 4 fault; ID5: AFCI self-checking circuit 5 fault; ID6: AFCI self-checking circuit 6 fault; ID7: AFCI self-checking circuit 7 fault; ID8: AFCI self-checking circuit 8 fault; ID9: AFCI self-checking circuit 9 fault; ID10: AFCI self-checking circuit 10 fault; ID11: AFCI self-checking circuit 11 fault; ID12: AFCI self-checking circuit 12 fault; ID13: AFCI self-checking circuit 13 fault; ID14: AFCI self-checking circuit 14 fault; ID15: AFCI self-checking circuit 15 fault; ID16: AFCI self-checking circuit 16 fault

Likely causes:

• A one-off disturbance (for example a grid event)
• Internal component or circuit board fault
• Firmware issue

What you can safely do:

• Note the code and sub-ID from the mySigen app
• Restart once using the mySigen app (Settings > turn device off/on), the owner method in the SigenStor Home User Manual
• If the code returns, submit it via the app's Support > troubleshooting page or call us

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

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

Sub-IDs: ID1: AC side overload protection; ID2: AC side short circuit protection; ID3: AC side overvoltage protection; ID4: AC side undervoltage protection; ID5: AC side overfrequency protection; ID6: AC side underfrequency protection

Likely causes:

• Too many or too large appliances on backup circuits during an outage (for example ovens, air conditioners, pumps)
• High start-up surge from motors or compressors
• A short circuit on a backup circuit

What you can safely 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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

What it means: An emergency power-off (EPO) or emergency shutdown signal has been triggered, so the system has stopped on purpose.

Likely causes:

• Emergency stop or external shutdown switch operated
• Network/demand response command
• Wiring fault on the control input (if nobody operated a switch)

What you can safely do:

• Check whether someone pressed the EPO button or triggered an emergency shutdown
• Only release it, as the manual describes, once the reason for the shutdown is resolved and it is safe
• If nobody triggered it, call us

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

What it means: 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.

Likely causes:

• Grid disturbance or partial outage (for example one phase lost on a 3-phase supply)
• Supply problems on the network side
• Wiring or phase-order errors at installation (if it shows up from day one)

What you can safely 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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

What it means: 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.

Likely causes:

• Loose or missing earth connection on the inverter or array
• Neutral and earth problem in the AC wiring or switchboard
• Fault in the building's main earth

What you can safely 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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

What it means: 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.

Likely causes:

• A one-off disturbance (for example a grid event)
• Internal component or circuit board fault
• Firmware issue

What you can safely do:

• Note the code and sub-ID from the mySigen app
• Restart once using the mySigen app (Settings > turn device off/on), the owner method in the SigenStor Home User Manual
• If the code returns, submit it via the app's Support > troubleshooting page or call us

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

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

Likely causes:

• Short grid disturbance
• Running on a generator or a weak supply
• Grid settings that don't match the local network

What you can safely do:

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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

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

Sub-IDs: ID1: Software version mismatch; ID2: Software and hardware version mis- match; ID3: The protocol version does not match

Likely causes:

• Interrupted or partial firmware update
• Parts replaced with different firmware versions
• Incorrect model or country/region setting

What you can safely 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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

What it means: 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.

Likely causes:

• Damaged DC cable insulation (for example from rodents, UV or a pinched cable)
• Water in a DC connector, isolator or junction box
• A damaged solar panel or backsheet
• Heavy dew or rain can trigger it temporarily on marginal systems

What you can safely 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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

What it means: The battery module or its power module inside the SigenStor is too hot (sub-ID1 power module, ID2 battery module), so operation is limited or stopped.

Sub-IDs: ID1: High temperature of energy storage power module; ID2: High temperature of energy storage battery module

Likely causes:

• High ambient temperature or direct sun on the battery
• Poor ventilation around the battery
• Heavy charge/discharge loads
• An internal battery fault

What you can safely 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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

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

Sub-IDs: ID1: Energy storage control circuit abnor- mal; ID2: Abnormal energy storage battery module; ID3: Auxiliary power source anomaly; ID4: Master-slave communication anom- aly; ID5: Switch button stuck

Likely causes:

• Cell voltage or capacity imbalance
• Over-charge or over-discharge conditions
• Internal battery hardware (relay, sensor, circuit board) fault
• Firmware or configuration mismatch between battery modules

What you can safely 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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

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

Likely causes:

• Cold overnight or winter temperatures where the battery is installed

What you can safely 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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

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

Likely causes:

• Cell voltage or capacity imbalance
• Over-charge or over-discharge conditions
• Internal battery hardware (relay, sensor, circuit board) fault
• Firmware or configuration mismatch between battery modules

What you can safely 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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

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

Likely causes:

• Cell voltage or capacity imbalance
• Over-charge or over-discharge conditions
• Internal battery hardware (relay, sensor, circuit board) fault
• Firmware or configuration mismatch between battery modules

What you can safely 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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

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

Sub-IDs: ID1: Overvoltage protection of the power module; ID2: Overvoltage protection of the power module output; ID3: Overcurrent protection of the power module; ID4: Internal series module voltage imbal- ance; ID5: Internal parallel module current im- balance

Likely causes:

• Cell voltage or capacity imbalance
• Over-charge or over-discharge conditions
• Internal battery hardware (relay, sensor, circuit board) fault
• Firmware or configuration mismatch between battery modules

What you can safely 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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

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

Sub-IDs: ID1: Software and hardware version mis- match; ID2: Protocol version mismatch between devices

Likely causes:

• Interrupted or partial firmware update
• Parts replaced with different firmware versions
• Incorrect model or country/region setting

What you can safely 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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

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

Sub-IDs: ID1: Temperature too high; ID2: Temperature On The Grid Side Is Too High; ID3: Temperature On The Oil Engine Side Is Too High; ID4: Backup Port Temperature Too High; ID5: Load Port Temperature Too High

Likely causes:

• High ambient temperature or direct afternoon sun on the inverter
• Blocked air vents or heat sink (dust, cobwebs, stored items)
• A fan problem (on fan-cooled models)

What you can safely do:

• Check the unit isn't in direct sun and its vents and cover aren't blocked
• Wait. Sigenergy says it restarts once temperatures return to normal
• If it repeats, report it through mySigen (Support > troubleshooting) or call us

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

What it means: 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.

Sub-IDs: ID1: Auxiliary power source abnormal; ID2: Internal communication failure; ID3: Control circuit fault; ID4: Grid contactor open circuit fault; ID5: Grid contactor short circuit fault; ID6: Engine contactor open circuit fault; ID7: Engine contactor short circuit fault; ID8: Neutral point grounding relay open circuit fault; ID9: Neutral point grounding relay short circuit fault; ID8: Neutral point grounding relay open circuit fault; ID9: Neutral point grounding relay short circuit fault

Likely causes:

• A one-off disturbance (for example a grid event)
• Internal component or circuit board fault
• Firmware issue

What you can safely do:

• Note the code and sub-ID from the mySigen app
• Restart once using the mySigen app (Settings > turn device off/on), the owner method in the SigenStor Home User Manual
• If the code returns, submit it via the app's Support > troubleshooting page or call us

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

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

Likely causes:

• Damaged DC or AC cable insulation
• Moisture in connectors or equipment
• A one-off disturbance (if it happens once and never again)

What you can safely do:

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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

What it means: 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.

Likely causes:

• Loose or missing earth connection on the inverter or array
• Neutral and earth problem in the AC wiring or switchboard
• Fault in the building's main earth

What you can safely 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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

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

Likely causes:

• AC wiring error at installation or after other electrical work
• Wiring on the meter or CT the wrong way round

What you can safely do:

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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

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

Likely causes:

• AC wiring error at installation or after other electrical work
• Wiring on the meter or CT the wrong way round

What you can safely do:

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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

What it means: 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.

Likely causes:

• Grid disturbance or partial outage (for example one phase lost on a 3-phase supply)
• Supply problems on the network side
• Wiring or phase-order errors at installation (if it shows up from day one)

What you can safely 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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

What it means: 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.

Sub-IDs: ID1: Grid phase A overvoltaged; ID2: Grid phase B overvoltaged; ID3: Grid phase C overvoltaged; ID4: Grid phase A undervoltaged; ID5: Grid phase B undervoltaged; ID6: Grid phase C undervoltaged; ID7: Grid overfrequency; ID8: Grid underfrequency

Likely causes:

• High street voltage, common on sunny afternoons when many homes export solar
• Grid disturbances or voltage dips
• Long or undersized AC cabling between the inverter and the switchboard (installation issue)
• Grid protection settings that don't match your network's requirements

What you can safely 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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

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

Sub-IDs: ID1: Generator phase A overvoltaged; ID2: Generator phase B overvoltaged; ID3: Generator phase C overvoltaged; ID4: Generator phase A undervoltaged; ID5: Generator phase B undervoltaged; ID6: Generator phase C undervoltaged; ID7: Generator overfrequency; ID8: Generator underfrequency

Likely causes:

• Generator output out of range
• Generator wiring or phase-order error
• Generator failed to start

What you can safely do:

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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

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

Sub-IDs: ID1: Overvoltage on Load Phase A; ID2: Overvoltage on Load Phase B; ID3: Overvoltage on Load Phase C; ID4: Undervoltage on Load Phase A; ID5: Undervoltage on Load Phase B; ID6: Undervoltage on Load Phase C; ID7: Overfrequency on Load; ID8: Underfrequency on Load

Likely causes:

• Too many or too large appliances on backup circuits during an outage (for example ovens, air conditioners, pumps)
• High start-up surge from motors or compressors
• A short circuit on a backup circuit

What you can safely 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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

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

Likely causes:

• Generator output out of range
• Generator wiring or phase-order error
• Generator failed to start

What you can safely do:

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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

What it means: An emergency power-off (EPO) or emergency shutdown signal has been triggered, so the system has stopped on purpose.

Likely causes:

• Emergency stop or external shutdown switch operated
• Network/demand response command
• Wiring fault on the control input (if nobody operated a switch)

What you can safely do:

• Check whether someone pressed the EPO button or triggered an emergency shutdown
• Only release it, as the manual describes, once the reason for the shutdown is resolved and it is safe
• If nobody triggered it, call us

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

What it means: The Gateway's bypass switch is reported open/abnormal.

Likely causes:

• Bypass switch operated (for maintenance)
• Gateway fault

What you can safely do:

• Note the code and sub-ID from the mySigen app
• Restart once using the mySigen app (Settings > turn device off/on), the owner method in the SigenStor Home User Manual
• If the code returns, submit it via the app's Support > troubleshooting page or call us

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

What it means: The Gateway's bypass switch is reported switched on (system bypassed).

Likely causes:

• Bypass switch operated (for maintenance)
• Gateway fault

What you can safely do:

• If nobody has operated the bypass switch, call us

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

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

Sub-IDs: ID1: Gateway communication anomaly; ID2: Electric meter communication anom- aly; ID3: AC power sensor communication anomaly

Likely causes:

• Meter or CT communication cable loose or damaged
• CT clamp fitted on the wrong cable or the wrong way round
• Meter has lost power or is faulty

What you can safely 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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

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

Likely causes:

• Generator output out of range
• Generator wiring or phase-order error
• Generator failed to start

What you can safely do:

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

Source: Sigenergy Alarm List, Version 04, released 2024-11-18

What it means: Sigenergy lists a "CLS malfunction" and says it can be cleared manually in the app. The manual doesn't explain the term further.

Likely causes:

• Not specified by the manufacturer

What you can safely do:

• Clear it from the mySigen app as Sigenergy describes
• If it returns, call us

Source: Sigenergy Alarm List, Version 04, released 2024-11-18