Motor protection breaker (FB1) tripped — Compressor power cut due to excessive current

What does FB1 tripped mean?

The motor protection breaker, labelled FB1, has automatically cut the power supply to the compressor. This is a safety mechanism that activates if the compressor's current draw becomes too high.

• Compressor overload or malfunction
• Electrical fault or short circuit in the compressor circuit
• Incorrect phase sequence (especially for F1245-12 models)
• Issues with the motor or its components

Click steps to track your progress.

1. 1

   Power off the heat pump at the main circuit breaker.

2. 2

   Allow the unit to cool down completely for at least 30 minutes.

3. 3

   Carefully open the front cover to access FB1, which is located behind the front cover.

4. 4

   Reset the motor protection breaker by twisting its control knob to the horizontal position.

5. 5

   Power on the heat pump and monitor its operation. If it trips again, contact NIBE service.