U6 - Compressor over current (Overload) cut off in outdoor unit

What does U6 mean?

This error indicates that the outdoor unit's compressor has experienced an overload and has shut down to protect itself from damage.

• Overheating compressor due to dirty coils or poor airflow.
• Low refrigerant charge.
• Electrical issues (e.g., voltage fluctuations).
• Faulty compressor motor.
• Restricted refrigerant flow.

Click steps to track your progress.

1. 1

   Turn off the main power to the AC system at the circuit breaker and wait 30 minutes for the compressor to cool down.

2. 2

   Clear any obstructions from around the outdoor unit and clean the condenser coils if they are dirty.

3. 3

   Ensure that the outdoor fan is working correctly.

4. 4

   If the issue persists after a reset, contact a qualified HVAC technician to inspect the compressor and electrical system.