1102 <1202> (U2) Compressor temperature trouble

What does 1102 <1202> (U2) mean?

This error indicates that the compressor is operating at an abnormally high temperature. Causes can include issues with stop valves, refrigerant shortage, defective sensors, or blockages in the refrigerant system.

• Malfunction of stop valve.
• Over-heated compressor operation caused by shortage of refrigerant.
• Defective thermistor.
• Defective outdoor controller board.
• LEV (Linear Expansion Valve) performance failure.
• Defective indoor controller board.
• Clogged refrigerant system caused by foreign object.
• Refrigerant shortage while in heating operation (liquid accumulation in compressor while indoor unit is OFF/thermo-OFF).

Click steps to track your progress.

1. 1

   Turn off the power to the entire system at the circuit breaker.

2. 2

   Verify that all stop valves are fully open.

3. 3

   Inspect the outdoor unit and refrigerant lines for any signs of refrigerant leakage.

4. 4

   Ensure air filters on indoor units are clean to maintain proper airflow.

5. 5

   Restore power. If the error returns, contact a qualified HVAC technician for diagnosis of refrigerant levels, sensors, and valves.