459 Error receiving measuring signal for insulation test - sensor issue for safety test.

What does 459 mean?

The inverter is having an error receiving the necessary measuring signal to perform its insulation test. This can prevent it from starting or operating safely.

• Faulty sensor.
• Internal wiring issue for insulation test.
• Software problem.

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 persists, contact a Fronius-trained service technician.