E55 - Compressor under dome thermistor disconnected

What does E55 mean?

This error indicates that the thermistor located under the compressor dome in the outdoor unit is disconnected, preventing accurate temperature monitoring.

• Loose or disconnected wiring for the compressor under dome thermistor.
• Faulty thermistor sensor.
• Damage to the thermistor wiring or connector.

Click steps to track your progress.

1. 1

   Turn off the main power supply to the outdoor unit at the circuit breaker.

2. 2

   Contact a qualified HVAC technician to inspect the compressor under dome thermistor and its connections.

3. 3

   The technician will ensure the wiring is secure and the thermistor is properly seated.

4. 4

   If the thermistor is faulty, it will require professional replacement.