What does Growatt error 203 mean?
203 means the insulation between the panels or DC wires and earth has become weak. It often shows in the morning after rain, dew or damp, and clears once the sun dries things out.
Why does code 203 appear?
- A DC connector or junction box is wet after rain or damp.
- A DC wire's sheath is cut or chewed by rats.
- Panel or inverter earthing is poor.
- Water got into the DC breaker box.
What can you safely check for 203?
- Wait for the sun to come out. The code often clears once things dry.
- Look from a distance for a cut or hanging DC wire. Don't touch it.
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 203 stays in dry weather, call a solar mistri. Testing insulation and repairing DC wires is for a trained mistri only: DC is always live in sunlight. 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.