474 RCMU sensor faulty - Residual Current Monitoring Unit sensor error.

What does 474 mean?

The sensor for the Residual Current Monitoring Unit (RCMU) is faulty, preventing the inverter from feeding energy into the grid. This is a safety-critical component.

• Faulty RCMU sensor.
• Internal hardware failure.

Click steps to track your progress.

1. 1

   Perform an AC reset by switching the automatic circuit breaker for the inverter off and then on again.

2. 2

   Observe if the inverter attempts to restart and the code clears.

3. 3

   If this status code keeps recurring, contact your system installer for inspection and repair.