UF — Compressor current interruption or locked compressor

What does UF mean?

This critical error indicates that the compressor has either experienced an interruption in its current supply or is mechanically locked, preventing it from starting or operating.

• Electrical supply issue to the compressor.
• Compressor motor fault or winding issue.
• Seized or mechanically locked compressor.
• Control board failure affecting compressor operation.

Click steps to track your progress.

1. 1

   Check the main circuit breaker for the outdoor unit to ensure it has not tripped.

2. 2

   Verify that the power supply to the outdoor unit is stable and within the voltage specifications for your model.

3. 3

   Power cycle the unit by turning off the main power for at least 10 minutes, then restart.

4. 4

   Listen for any unusual noises coming from the compressor when the unit attempts to start.

5. 5

   If the compressor remains locked or the error reappears, contact a qualified technician immediately as this is a serious fault.