Error 408 on a Growatt MIN 2500-6000TL-X: Over Temperature
Short answer
On a Growatt inverter, Error 408 means: Over Temperature. The inverter keeps running with some functions stopped.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: Over Temperature.
Part involved: Heatsink / internal temperature.
Likely causes:
- Temperature.
Is it safe?
| Does the inverter stop? | Partly |
|---|---|
| Severity | Fault — clears by itself when the condition goes |
The inverter keeps running with some functions stopped.
Resetting itself: yes - derates or stops and restarts when cooled.
Manual reset: no.
What you can check
- Read and note the exact code and time from the inverter display or app (screenshot).
- Check nothing is covering or stacked against the inverter and the cooling fins are not blocked (look only).
- Note if it is in direct afternoon sun or a hot loft.
- 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
- Check clearances per manual.
- Clean heatsink/fans.
- Check fan operation.
- Consider relocation or shading.
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