UE — High pressure trouble

What does UE mean?

This error signifies that the system's high-pressure level is too high. This triggers an automatic shutdown of the unit to prevent damage.

• Refrigerant overcharge in the system.
• Outdoor unit fan malfunction or obstruction.
• Dirty or blocked outdoor unit heat exchanger coils.
• Restricted airflow around the outdoor unit.
• Closed liquid line service valve in cooling mode.

Click steps to track your progress.

1. 1

   Verify that the outdoor unit fan is running freely and is not obstructed by debris.

2. 2

   Clean the outdoor unit's heat exchanger coils thoroughly to improve heat dissipation.

3. 3

   Ensure all refrigerant service valves are fully open, especially the liquid line valve if the unit is in cooling mode.

4. 4

   Power cycle the unit by turning off the main breaker for a few minutes and then restarting.

5. 5

   If the problem continues, a technician should verify refrigerant charge and system pressures.