Fault Code Reference

Sigenergy Fault Codes

Sigenergy hybrid inverters and all-in-one storage systems. Covers SigenStor and SigenEnergy products widely installed in UK residential and commercial solar projects.

71

Fault codes

Device types covered

Inverter (71)

Common fault codes

Software Version Mismatch

Attempt the firmware upgrade again via the mySigen App

Low Insulation Resistance

Check DC cable for short circuits or broken cables. Check positive and negative …

Over-Temperature

Machine will normally restart after temperature returns to normal. Check ventila…

Equipment Fault

Give standby/shutdown instruction. Disconnect DC and AC switches. Wait a few min…

System Grounding Fault

Check whether the protective ground wire is connected normally

PV String Overvoltage

Machine will restart after environment returns to normal. Measure PV voltage of …

All Sigenergy fault codes

Software Version Mismatch

Attempt the firmware upgrade again via the mySigen App

Low Insulation Resistance

Check DC cable for short circuits or broken cables. Check positive and negative …

Over-Temperature

Machine will normally restart after temperature returns to normal. Check ventila…

Equipment Fault

Give standby/shutdown instruction. Disconnect DC and AC switches. Wait a few min…

System Grounding Fault

Check whether the protective ground wire is connected normally

PV String Overvoltage

Machine will restart after environment returns to normal. Measure PV voltage of …

PV String Reverse Connection

Wait for PV string current to drop below 0.5A. Disconnect DC switch. Correct pol…

PV String Sinking Current

Check whether alarm string has fewer panels than other strings. If so, wait for …

Turn off DC switch. Inspect faulty string for cable damage, poor connector conta…

Grid Power Outage

Inverter will reconnect automatically when grid returns. Check whether grid supp…

Grid Overvoltage

Inverter will reconnect when grid returns to normal. Measure actual grid voltage

Grid Undervoltage

Inverter will reconnect when grid returns to normal. Measure actual grid voltage

Grid Overfrequency

Inverter will reconnect when grid returns to normal. Measure actual grid frequen…

Grid Underfrequency

Inverter will reconnect when grid returns to normal. Measure actual grid frequen…

Grid Voltage Imbalance

Inverter will reconnect when grid returns to normal. Measure actual grid voltage…

DC Component of Output Current Out of Limit

If occasional, likely caused by transient environmental change. Equipment will r…

Leak Current Out of Limit

If occasional, likely caused by transient environmental change. Equipment will r…

Communication Fault

ID1: Check 4G data balance, recharge if needed. ID2/ID3/ID4: Restart device. Che…

Internal Protection

If occasional, may be caused by transient environmental change. Equipment will r…

Abnormal AFCI Self-Checking Circuit

In APP: clear AFCI self-test circuit abnormality. Restart device and wait for re…

Inverter AC Side Voltage Abnormal

ID1: Reduce load power. ID2: Check for AC output short circuit. ID3: Reduce gene…

Manual Operation Protection / Rapid Shutdown

Confirm there are no safety hazards on site before resetting. Press emergency st…

Neutral Line Loose or AC Wiring Abnormal

Isolate inverter (AC off, DC off). Check neutral terminal at AC connection block…

Abnormal Phase Sequence

Adjust the sequence of the three-phase wiring on the AC output side

Short Circuit to PE

Check for phase-to-ground short circuit on the grid side wiring

Soft Start Failure

If occasional, equipment will return to normal automatically after environment s…

Grid Frequency Unstable

If occasional, caused by instantaneous grid frequency fluctuation. Equipment wil…

Software Version Mismatch

Upgrade system software again via APP

Energy Storage Module Low Insulation Resistance

Issue standby/shutdown command via APP. Disconnect DC and AC switches. Wait a fe…

Over-Temperature

Check ventilation at installation location is good and not obstructed

Equipment Fault

Issue standby/shutdown command via APP. Disconnect DC and AC switches. Wait a fe…

Under-Temperature

Wait for system self-heating to bring battery to operating temperature range. Fa…

Battery Module Over-Voltage

Battery module or cells have too high a voltage — battery may be overcharged.

Battery Module Under-Voltage

Battery module or cells have too low a voltage — may be caused by prolonged stor…

Internal Protection

If occasional, may be caused by transient environmental change. Equipment will r…

Software Version Mismatch

Upgrade again via APP

Over-Temperature

Check ventilation at installation location is good and improve if needed

Equipment Fault

Issue standby/shutdown command via APP. Disconnect DC and AC switches. Wait a fe…

Too High Off-Grid Output Leak Current

Check load for insulation damage

Neutral Point Grounding Fault

Check functional ground is effectively connected to external ground

Abnormal Phase Sequence of Power Grid Wiring

Check wiring at the power grid input terminal is correct

Load Side Wiring Phase Sequence Abnormal

Check load side wiring is correct

Grid Phase Loss

Check terminal wiring on grid side — confirm all three-phase grid voltages are c…

Check grid voltage/frequency. If grid is abnormal, wait for grid to return to no…

Generator Failure

Check generator voltage/frequency. If generator is abnormal, wait for it to retu…

Check load frequency/voltage. If load is abnormal, wait for return to normal — a…

Abnormal Phase Sequence of Engine Connection

Check wiring at oil machine input terminal is correct

Emergency Shutdown

Cancel emergency shutdown signal when system returns to normal

Bypass Switch Open

Check equipment is functioning normally. If Gateway is abnormal, disconnect inve…

Bypass Switch On

Check equipment is functioning normally. If Gateway is abnormal, disconnect inve…

Contactor Coil Overvoltage

Disconnect grid switch (air switch) via app and wait a few minutes

Cabinet Door Opens

Verify cabinet door is fully closed and latched

Frame Circuit Breaker Overcurrent Protection

Reduce load power on the affected circuit

Frame Circuit Breaker Service Life Exceeded

Contact professional staff to replace breaker

Communication Fault

ID1: Check Gateway communication interface is reliably connected. Confirm intern…

CT Wiring Anomaly

Verify CT connections match installation diagram exactly

Diesel Generator Startup Failure

Engine start anomaly — generator failed to start when called by system.

Manually clear via App interface

Feed-in Power Limit Hard Protection

Check if anti-backflow protection is enabled in settings

DI Custom Fault

ID1: Check for system grounding faults. ID2: Check meter communication and verif…

Equipment Protection

ID1/ID2: Charger reconnects when grid returns to ±20%. Measure actual grid volta…

Equipment Fault

Restart the charging pile. Check whether fault is eliminated

Over-Temperature

Check whether charger is in direct sunlight. Check for nearby heat sources. Conf…

Charging Cable Fault

Remove charging cable. Use multimeter to measure resistance between PP and PE. E…

Meter Communication Fault

Check RS485 cable between charging pile and meter is connected correctly

Software Version Mismatch

Upgrade again via mySigen App

Low Insulation Resistance

Check DC cable for short circuit or broken cable. Check positive and negative po…

Over-Temperature

ID1: Check ventilation, check for direct sunlight, check fan is functioning norm…

Equipment Fault

ID1: Check fan connector is seated. Check for abnormal noise or blade deformatio…

ID1: Check charging plug is seated. Check CP circuit. ID2/ID3: Check for control…

Equipment Protection

If occasional, may be caused by environmental changes or special working conditi…

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