AC module temperature sensor faulty (L1)

What does 406 mean?

This code indicates a fault with the temperature sensor monitoring the AC module for phase L1. A faulty sensor can lead to inaccurate temperature readings, potentially causing the inverter to operate outside safe thermal limits or prevent feed-in.

• Malfunction of the temperature sensor itself for L1.
• Break in the sensor's wiring or connection to the control board.
• Damage to the sensor due to heat or mechanical stress.

Click steps to track your progress.

1. 1

   If the status code is displayed continuously, notify a Fronius-trained service engineer for sensor inspection or replacement.

2. 2

   Perform an AC reset to clear any transient sensor errors.

3. 3

   Verify connections to the L1 AC module temperature sensor.