Error 425 on a Growatt MIN 2500-6000TL-X: AFCI self-test fault
Short answer
On a Growatt inverter, Error 425 means: AFCI self-test 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: AFCI self-test fault.
Part involved: Arc fault detection (AFCI).
Likely causes:
- AFCI self-test failed.
Is it safe?
Switch the inverter off at its isolator and call an engineer.
| Does the inverter stop? | Yes |
|---|---|
| Severity | Safety lockout |
| Engineer needed? | Yes |
The inverter stops until the fault clears or is reset.
Resetting itself: no (brand-dependent: some models auto-clear a limited number of times).
Manual reset: yes - after an installer has inspected the DC side.
What you can check
- Read and note the exact code and time from the inverter display or app (screenshot).
- Leave the system off at the AC isolator if you smell burning or see scorching and call the installer.
- Do not reset repeatedly.
- Growatt's manual says 'restart inverter'. A homeowner can switch the inverter off and on at its AC isolator/breaker; leave DC switching to the installer unless the manual step says to switch DC off immediately (Error 202).
What the engineer will check
- Inspect every DC connection/MC4 pair, optimiser/connector mismatches, damaged cable.
- Thermal-image the array and DC isolators.
- Follow manufacturer arc-fault application note before clearing.
Who to ask for: PV installer.
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
- Growatt MIN 2500-6000TL-X Installation & Operation (User) Manual, general EN 2022-06 ↗ · EN 202206 · page PDF p.23 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026