Growatt Error 100: Voltage Failure
Error 100 is an internal voltage failure. The Growatt detected that an internal voltage is not where it should be, which usually points to a hardware issue on the inverter's board rather than something on the grid or panel side you can fix from the outside. A single restart is worth trying, but a persistent Error 100 needs a professional.
What it usually means
- An internal power-supply or board fault where a reference voltage is out of spec.
- Occasionally a transient that a full power-down clears.
What to do
- Do one full power-down and restart. Turn off the AC breaker, then the DC isolator, wait 5 minutes, then power back up. This clears a one-off glitch.
- If Error 100 returns, stop. It is an internal fault, not something you adjust externally.
- Contact your installer or Growatt with the code and your inverter model. This typically needs board-level service.
When to bring in a professional
A returning Error 100 is an internal hardware fault. Don't keep power-cycling it; have your installer or Growatt diagnose it.
Related Growatt codes
Sources
- Growatt inverter user manual and error-code reference (Error 100 = voltage failure; request maintenance from your installer).
- Growatt installer documentation.
⚠️ Safety disclaimer. Solar inverters carry lethal DC and AC voltage even when "off". This guide covers a single safe power cycle only. Internal faults must be diagnosed by a licensed installer or Growatt technician.