E35 - Outdoor unit heat exchanger sensor (ThOR) defective or cooling high pressure

What does E35 mean?

This error indicates that the outdoor unit's heat exchanger sensor (ThOR) is defective (open or closed circuit), has a poor connection, or the system is experiencing cooling high pressure.

• Faulty ThOR sensor (resistance issue).
• Poor connection of the ThOR sensor connector on the outdoor unit PCB.
• System operating under high cooling pressure.
• Restricted airflow or dirty outdoor coil contributing to high pressure.

Click steps to track your progress.

1. 1

   Turn off the main power to the AC system at the circuit breaker.

2. 2

   Clear any debris or obstructions around the outdoor unit to ensure good airflow.

3. 3

   A qualified technician should inspect the ThOR sensor and its connections on the outdoor unit's PCB.

4. 4

   The technician will check the sensor's resistance and diagnose high pressure if applicable.