1102 — Compressor temperature trouble

What does 1102 mean?

This code indicates that the compressor's temperature (detected by thermistor TH4) has become excessively high, either continuously exceeding 110°C (230°F) for 5 minutes or momentarily going above 125°C (257°F). This signifies that the compressor is overheating, which can lead to severe damage.

• Outdoor stop valve not fully open.
• Refrigerant shortage or leakage in the system, leading to inefficient cooling of the compressor.
• A clogged refrigerant system caused by foreign objects.
• Faulty compressor thermistor (TH4) or its wiring/connection.
• Malfunctioning electronic expansion valve (LEV) or indoor controller board.

Click steps to track your progress.

1. 1

   Ensure the outdoor stop valve (liquid/gas) is fully open. These valves should be completely open during operation to allow proper refrigerant flow.

2. 2

   Check for any visible signs of refrigerant leaks around the outdoor unit or piping connections, as low refrigerant can cause the compressor to overheat.

3. 3

   Turn off the main power to the unit at the circuit breaker, wait for a few minutes, then turn it back on to reset the system.

4. 4

   If the issue persists, a qualified HVAC technician should be contacted to check for refrigerant leaks, inspect the system for clogs, and evaluate the thermistor and valves.