IE31 on a SolaX Power SolaX X1-Hybrid G4: ChargeRelayFault - charge relay fault
Short answer
On a SolaX Power inverter, IE31 means: ChargeRelayFault - charge relay fault. 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: ChargeRelayFault - charge relay fault.
Part involved: Grid relay / relay test.
Likely causes:
- Charge relay fault.
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: may clear at next start if caused by N-PE issue.
Manual reset: installer.
What you can check
- Read and note the exact code and time from the inverter display or app (screenshot).
- Check the solar/battery AC isolator and the consumer-unit breaker/RCD are ON (do not reset a breaker that trips again immediately).
- The SolaX manual lists 'press the ESC key to restart the inverter' for this code (switch off heavy loads first for overload codes).
- Where the SolaX manual says 'press the ESC key to restart the inverter', a homeowner can do that on the display. Steps that say 'disconnect PV+/PV-/battery' are for the installer only.
What the engineer will check
- Check N and PE connections and N-PE voltage.
- Restart.
- Replace inverter if relay test keeps failing.
Who to ask for: PV installer / electrician.
Certification: Electrician competent in grid-connected PV (BS 7671 Section 712; IET Code of Practice for Grid-connected Solar PV), ideally the original MCS-certified PV installer; brand-approved/trained installer to keep manufacturer warranty.
What you might notice
Sources
- X1-Hybrid-G4 3.0/3.7/5.0/6.0/7.5 kW User Manual Version 3.0 (Version 03, 2024-08-08), doc 320101081103 ↗ · 3.0 · page PDF p.125 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026