14ETU on a GoodWe Technologies Co., Ltd. GoodWe ET / ET Plus+: Phase order Fault - AC phases incorrectly connected (three-phase ET)
Short answer
On a GoodWe Technologies Co., Ltd. inverter, 14ETU means: Phase order Fault - AC phases incorrectly connected (three-phase ET). 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: Phase order Fault - AC phases incorrectly connected (three-phase ET).
Part involved: AC phase sequence.
Likely causes:
- AC phases incorrectly connected (three-phase ET). | Troubleshooting: Swap L2 and L3 on AC terminals; update firmware.
Is it safe?
| Does the inverter stop? | Yes |
|---|---|
| Engineer needed? | Yes |
The inverter stops until the fault clears or is reset.
Resetting itself: unknown.
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.
- Contact your installer.
What the engineer will check
- Swap L2/L3; firmware update.
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 16 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026