Solar · Error codes · GoodWe Technologies Co., Ltd.
relay-check-failureGoodWe Technologies Co., Ltd. · GoodWe DNS (2.9-6 kW)
relay-check-failure on a GoodWe Technologies Co., Ltd. GoodWe DNS: Relay-Check Failure
Short answer
On a GoodWe Technologies Co., Ltd. inverter, relay-check-failure means: Relay-Check Failure. 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: Relay-Check Failure.
Part involved: Relay-Check Failure.
Likely causes:
- Turn off DC switch, wait until LCD off, turn on DC switch; contact service if it persists.
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: unknown.
Manual reset: See checks.
What you can check
- Read the message on the inverter LCD or in the SEMS Portal app and note it for your installer.
- GoodWe's remedy is a DC-switch power cycle at the inverter (switch off, wait for the display to go out, switch on). Only do this if your installer has shown you the inverter's DC switch; otherwise ask them.
What the engineer will check
- Power-cycle per manual; service if persistent. Same remedy listed for DCI Injection High, EEPROM R/W Failure, SPI Failure, DC BUS High, GFCI Failure.
Who to ask for: GoodWe-trained PV installer.
Certification: Qualified electrician (BS 7671; MCS-certified PV installer for work on the PV array/DC side).
What you might notice
Sources
- User Manual Grid-Tied PV Inverter DNS Series 2.9-6kW ↗ · V1.3-2026-09-10 · page 39 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026