What does Growatt error 409 mean?
409 means the inverter's internal DC (bus) voltage went too high, so it stopped working. Sometimes it follows high panel voltage or a grid problem; sometimes it is an internal fault.
Why does code 409 appear?
- Too many panels in one string, so the voltage rises in cool weather.
- Grid voltage or the connection is not right.
- A part inside the inverter is faulty.
What can you safely check for 409?
- Switch the inverter off, wait 5 minutes and switch it on again.
- Note what time the code appeared (cool morning sun or midday).
Safety: never reach into an electrical panel, board, gas pipe or the inside of an inverter yourself. You can get a shock or release gas. This is a mistri's job.
When should you call a mistri?
If 409 stays after a restart, call a solar mistri. Measuring panel voltage and changing strings is their job. An inverter carries DC current from the panels and battery that can kill, even after the mains is off. Never open the inverter cover or the DC wires yourself.