E39 - Compressor discharge temperature sensor (ThOD) defective

What does E39 mean?

The compressor discharge temperature sensor (ThOD) has a defective resistance (open circuit) or a poor connection on the outdoor unit PCB. This sensor monitors the temperature of the refrigerant leaving the compressor.

• Damaged compressor discharge temperature sensor (ThOD).
• Poor connection of the sensor connector on the outdoor unit PCB.

Click steps to track your progress.

1. 1

   Turn off the air conditioning unit at the main circuit breaker.

2. 2

   Wait for 30 seconds, then restore power.

3. 3

   If the error persists, contact a qualified service technician to inspect the sensor and its connections.