GoodWe Inverter Fault Codes – The Complete Aussie Guide (2025)
Why GoodWe throws System Fault and Inverter Failure codes
GoodWe keeps things simple:
- System Fault — something outside the box (grid, insulation, temperature).
- Inverter Failure — a hardware or firmware issue inside the unit.
Both classes meet AS 4777.2:2020 protection rules, shutting down if voltage, frequency or leakage drifts out of spec.
Finding your code
- Single-phase DNS / three-phase SDT / MT, etc. – tap ▲/▼ until the LCD shows
FAULT ##. - Hybrid ES / EH / ET – open the PV Master or SolarGo app → Parameters → Alarm.
- SEMS Portal – Plant → Alarms for remote checking.
- LED-only XS / SBP – count the red blinks, then match the table in the manual.
Press the Enter button to clear latched messages once the cause is fixed.
GoodWe Fault-Code Cheat-Sheet
System-Fault codes – grid, insulation & environment
| Code | Message on screen/app | What it means in AU context |
|---|---|---|
| 00 | GFCI Check Timeout | Leakage-test took too long – usually moisture on the roof |
| 03 | Fac Fail | Grid frequency outside 49.5–50.5 Hz band |
| 14 | Isolation Fail | PV–earth resistance < 200 kΩ (wet conduit or DC nick) |
| 15 | Vac Fail | Grid voltage > 255 V or < 200 V |
| 17 | PV Over-Voltage | String Voc above inverter max (mis-strung array) |
| 19 | Over Temp | Heat-sink > 85 °C – common on west-facing sheds |
| 22 | Ground I Fail | Leakage current too high – check neutral/earth bond |
| 23 | Utility Loss | Grid missing or AC isolator off |
| 26 / 32 | GFCI Fail | Ground-fault circuit failed self-test |
| 29 | FAC Fail | Same as code 3 on some hybrids |
| 30 | Ref 1.5 V Fail | Low-voltage rail out of spec |
Inverter-Failure codes – internal hardware (call a sparky)
| Code | Message | Likely fix |
|---|---|---|
| 01 | SPI Fail | Reboot; if persistent, main board swap |
| 02 | EEPROM Fail | Firmware re-flash or control board |
| 07 / 25 | Relay Check Fail | Replace relay board |
| 12 | LCD Comm Fail | Ribbon cable / LCD board |
| 13 | DC Injection High | CT or power board fault |
| 16 | E-Fan Fail | External 24 V fan or harness |
| 20 | I-Fan Fail | Internal fan |
| 21 | DC Bus High | DC-link capacitors or PV volts too high |
| 24 / 31 | AC HCT Fail | Output current sensor fault |
| 30 | Ref 1.5 V Fail | Low-voltage reference rail |
DIY checks before you call
- Full reboot: AC isolator → DC isolator OFF, wait 5 min, then DC → AC ON.
- Switchboard voltage: anything above 252 V will keep code 15 alive – Energex can drop the street tap.
- Moisture hunt: see codes 14/22? Open rooftop isolators and look for water or green earth screws.
- Airflow: clear 300 mm around the fins; a cheap shade hood knocks 15 °C off internal temps.
Safety first: anything inside the cover or DC connectors is licenced-sparky work in Queensland.
When to ring Universe Solar (Gold Coast)
- Vac Fail (15) that reappears after sunrise despite 245–250 V at the switchboard.
- Relay / fan / SPI faults (#01–02, #07/25, #16/20).
- Isolation, GFCI or Ground-I codes that stick around in dry weather.
- Battery or backup faults on ES/EH/ET hybrids.
📞 Free Consultation: 1300 363 178 • universesolar.com.au
Preventative care
- Annual fan clean: DNS/SDT models have a clip-out grille – 5 min with a soft brush.
- Firmware updates: SEMS → Maintenance → OTA Update – takes ~10 min.
- Shade the inverter: arvo sun kills caps early.
- Surge protection: fit DIN-rail arresters before the summer storm season.
FAQ
Q : Will a Vac Fail stop my feed-in tariff?
A : Yes—export drops to zero until grid voltage is back in range or the inverter resets.
Q : Can I change the safety country to widen limits?
A : No. AS 4777 settings are locked; only CEC-accredited installers can adjust them.
Q : My inverter shows Isolation Fail only after rain—bad?
A : Likely water inside a rooftop isolator. Dry it out and reseal, then reboot.
Need a hand?
Universe Solar services GoodWe inverters from Tweed to Brisbane. Book online or call 1300 363 178 and get your solar savings flowing again today.
