UF - Compressor over current (start-up locked or operating locked) cut off in outdoor unit

What does UF mean?

This error indicates that the compressor has either failed to start up or has locked during operation, drawing excessive current and triggering a protective shutdown.

• Compressor motor failure.
• Electrical supply issues to the compressor.
• Start capacitor fault.
• Insufficient refrigerant or system imbalance.
• Compressor seized or mechanically locked.

Click steps to track your progress.

1. 1

   Turn off the main power to the AC system at the circuit breaker and wait at least 30 minutes.

2. 2

   Inspect the outdoor unit for any visible signs of damage or unusual conditions.

3. 3

   If the error persists, contact a qualified HVAC technician immediately to inspect the compressor, starting components, and refrigerant levels.

4. 4

   Do not force the unit to operate, as this can cause severe damage.