02ETU on a GoodWe Technologies Co., Ltd. GoodWe ET / ET Plus+: AFCI Fault - Intermittent fault from external factors (e.g. magnetic fields) or possible faulty internal component
Short answer
On a GoodWe Technologies Co., Ltd. inverter, 02ETU means: AFCI Fault - Intermittent fault from external factors (e.g. magnetic fields) or possible faulty internal component. The inverter stops until the fault clears or is reset. An engineer is needed to fix the cause.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: AFCI Fault - Intermittent fault from external factors (e.g. magnetic fields) or possible faulty internal component.
Part involved: arc fault detection (ET).
Likely causes:
- Intermittent fault from external factors (e.g. magnetic fields) or possible faulty internal component. | Troubleshooting: Restart the inverter; if the fault does not recur it was intermittent; if it remains contact service centre.
Is it safe?
| Does the inverter stop? | Yes |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
The inverter stops until the fault clears or is reset.
Resetting itself: no.
Manual reset: Restart per GoodWe troubleshooting guide.
What you can check
- Check the inverter LEDs (FAULT LED on = fault) and read the alarm in the SEMS Portal app or SolarGo app; note code, message and time for your installer.
- Do not touch DC cables or panels.
- GoodWe's first step for this code is a restart. Ask your installer to talk you through it or do it - GoodWe's guide is written for installers and the power-down sequence involves the DC switch and battery.
What the engineer will check
- Inspect DC connectors/strings for arcing; restart; contact service if persists.
Who to ask for: GoodWe-trained installer / MCS PV & battery installer.
Certification: Qualified electrician (BS 7671; MCS-certified PV installer for work on the PV array/DC side).
What you might notice
Sources
- Troubleshooting Guide Hybrid Inverter (ET, ET PLUS+, EH, ESA, ES, EM, EHB, ES G2; BT, BH, BP, SBP) - EMEA ↗ · V1.0-2023-03-10 · page 14 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026