Fault Code Reference

Sungrow Fault Codes

Sungrow hybrid and string inverters. One of the world's largest solar inverter manufacturers with a large installed base across UK homes and commercial sites.

49
Fault codes
Device types covered
Inverter (49)

Common fault codes

SG-001 · IDs 2,3,14,15
Grid Overvoltage
Wait — inverter auto-reconnects. If recurring, measure actual grid voltage at AC…
SG-002 · IDs 4,5
Grid Undervoltage
Wait — inverter auto-reconnects. If recurring, measure actual grid voltage at AC…
SG-003 · ID 8
Grid Overfrequency
Wait — inverter auto-reconnects. If recurring, measure actual grid frequency and…
SG-004 · ID 9
Grid Underfrequency
Wait — inverter auto-reconnects. If recurring, measure actual grid frequency.
SG-005 · ID 10
Grid Power Outage
Check whether grid is supplying power — test other loads in property. Confirm AC…
SG-006 · ID 12
Excess Leakage Current
If raining or recently rained, wait for dry conditions and monitor. Check weathe…

All Sungrow fault codes

SG-001 · IDs 2,3,14,15
Grid Overvoltage
Wait — inverter auto-reconnects. If recurring, measure actual grid voltage at AC…
SG-002 · IDs 4,5
Grid Undervoltage
Wait — inverter auto-reconnects. If recurring, measure actual grid voltage at AC…
SG-003 · ID 8
Grid Overfrequency
Wait — inverter auto-reconnects. If recurring, measure actual grid frequency and…
SG-004 · ID 9
Grid Underfrequency
Wait — inverter auto-reconnects. If recurring, measure actual grid frequency.
SG-005 · ID 10
Grid Power Outage
Check whether grid is supplying power — test other loads in property. Confirm AC…
SG-006 · ID 12
Excess Leakage Current
If raining or recently rained, wait for dry conditions and monitor. Check weathe…
SG-007 · ID 13
Grid Abnormal
Wait — inverter auto-reconnects. If recurring, measure actual grid voltage and f…
SG-008 · ID 17
Grid Voltage Imbalance
Wait — inverter auto-reconnects. If recurring, measure voltage on all three AC p…
SG-009 · ID 323
Grid Confrontation
Check AC wiring — confirm BACK-UP port is NOT connected to utility grid.
SG-010 · IDs 28,29
PV Input Mode Configuration Fault
Check PV input mode setting via iSolarCloud App or LCD — verify it matches the a…
SG-011 · IDs 448–479
PV Isolation Resistance Too Low
SAFETY: Do NOT disconnect DC switch while DC current above 0.5 A. Wait for low-i…
SG-012 · IDs 548–563, 580–595
PV String Abnormal Alarm
Check whether affected string's modules are shaded or dirty. Remove shading sour…
SG-013 · IDs 264–283
MPPT Reverse Connection
SAFETY: Wait for string current to drop below 0.5 A. Disconnect DC switch. Verif…
SG-014 · IDs 1548–1579
String Current Reflux
Identify affected string. Check if module count is lower than other strings on s…
SG-015 · IDs 1600–1655
PV Grounding Fault
SAFETY CRITICAL: Do NOT disconnect DC switch while DC current above 0.5 A. Wait …
SG-016 · ID 88
Electric Arc Fault (AFCI)
Disconnect DC switch to OFF. Inspect all DC cables for visible damage — cuts, ab…
SG-017 · ID 37
Excessively High Ambient Temperature
Check ambient temperature at installation — max operating temp is 60°C. Verify i…
SG-018 · ID 43
Excessively Low Ambient Temperature
Stop and disconnect inverter if possible. Wait for ambient temperature to rise a…
SG-019 · ID 39
Low System Insulation Resistance
If raining or recently rained, wait for dry conditions and re-check — moisture c…
SG-020 · ID 106
Grounding Cable Fault
SAFETY: De-energise system before inspecting. Check AC earth cable is correctly …
SG-021 · ID 51
Off-Grid Load Overpower Fault
Reduce total load on BACK-UP port below rated backup power (check model spec). D…
SG-022 · ID 1616
System Hardware Fault
SAFETY CRITICAL: Do NOT disconnect DC switch while DC current above 0.5 A. Wait …
SG-023 · System Fault (many IDs)
System Fault (General)
Wait for inverter to attempt automatic recovery. If no recovery, perform manual …
SG-024 · System Alarm (many IDs)
System Alarm (General)
Inverter continues running — no immediate shutdown required. Check all related w…
SG-025 · IDs 332–363
Boost Capacitor Overvoltage Alarm
Inverter continues running. Check related wiring and terminals for abnormalities…
SG-026 · IDs 364–395
Boost Capacitor Overvoltage Fault
Disconnect AC circuit breaker and DC switch (and battery switches if present). W…
SG-027 · ID 84
Meter or CT Reverse Connection
Check the meter display or iSolarCloud live readings — if Pa, Pb, or Pc shows a …
SG-028 · ID 514
Meter Communication Abnormal
Check the meter display is lit and showing readings — if blank, the meter has no…
SG-029 · ID 75
Inverter Parallel Communication Alarm
Inspect parallel communication cable and terminal connections. Ensure cable is s…
SG-030 · ID 714
BMS Communication Fault
Check battery is powered on. Inspect CAN/RS485 communication cable between inver…
SG-031 · ID 716
Abnormal Battery Connection
SAFETY: De-energise system before inspecting. Check battery power cable is conne…
SG-032 · IDs 703,711,712,715,717
Battery Fault – General / Over-Discharge
Generally clears within 20 minutes — wait and observe. If SOC is below 3%, switc…
SG-033 · IDs 707,733
Battery Over Temperature
Check for heat sources near battery (direct sunlight, heating equipment, poor ve…
SG-034 · IDs 708,734
Battery Under Temperature
Check ambient temperature at battery location. Charging is not permitted below 0…
SG-035 · ID 732
Battery Software Version Mismatch
Update hybrid inverter firmware to latest version via iSolarCloud. Update WiNet/…
SG-036 · IDs 735,736,737
Battery Internal Error (Restart Required)
Check if battery self-recovers. If not, switch off battery system and restart af…
SG-037 · ID 739
Battery Fault – Restart Required
Switch off battery system. Wait 5 minutes. Restart.
SG-038 · ID 740
Battery RACK Connection Issue
Switch off battery system. Check RACK connection is correctly and securely conne…
SG-039 · IDs 741,833
Battery System Configuration Error (Incorrect PACK Count)
Update hybrid inverter, WiNet, and battery firmware to latest versions. Verify P…
SG-040 · ID 742
Battery Inverse or Poor Power Cable Connection
SAFETY: De-energise system before inspecting. Check power cable polarity — posit…
SG-041 · IDs 743,744,745
Battery Fault – Firmware Update Resolves
Check if battery self-recovers. If not, upgrade battery firmware to latest versi…
SG-042 · ID 746
Battery PACK Order Error
Update hybrid inverter, WiNet, and battery firmware. If fault persists, contact …
SG-043 · ID 747
Battery Fault – Restart or Firmware Required
Switch off battery. Wait 5 minutes. Restart. If fault persists, upgrade battery …
SG-044 · IDs 932,935,937–940,964,840
Battery Alarm – General
Check if battery recovers automatically — most alarms are transient. Switch off …
SG-045 · ID 933
Battery Over Temperature Warning
Check for heat sources near battery. Measure ambient temperature — must be withi…
SG-046 · ID 934
Battery Under Temperature Warning
Check ambient temperature — charging minimum is 0°C. Improve installation enviro…
SG-047 · ID 4 (Optimizer)
Optimizer Input Overvoltage
Check cables between optimizer and PV module are reliably and correctly connecte…
SG-048 · ID 512 (Optimizer)
Optimizer Hardware Fault
Disconnect PV module from affected optimizer.
SG-049 · ID 1024 (Optimizer)
Optimizer Firmware Update Failed
Check current light conditions — update requires good solar irradiance. Retry up…
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