What you will see
- Error between 400 and 420
- Red light and the inverter stops
Why it happens
These are self-checks on the inverter's own circuits. A grid spike can trigger one once; repeated codes point to a hardware problem.
Diagram
What to do with 400-series errors
- 01Write down the exact code
- 02Restart once in the correct order
- 03Comes back?
- 04Call with code, photos and serial number
Common codes:
402 DCI404 Bus sample405 Relay409 Bus voltage414 EEPROM
What you can check yourself
- Write down the exact code
- Restart once using our safe restart guide
- Note if it returns at the same time or after the same event
What not to do
- Do not restart again and again
- Do not open the inverter
When to call us
- Read the fault history
- Check the firmware version (Warning 405 / Error 418 means a version mismatch)
- Raise a Growatt warranty case
Warranty cases
If a Growatt error keeps returning, we collect the details and help you raise a warranty case from Faisalabad or Lahore.
Send us
the code, alarm photos and the inverter serial number