E38 - Outside air temperature sensor (ThoA) defective

What does E38 mean?

The outside air temperature sensor (ThoA) is defective, either due to an open circuit or a poor connection on the outdoor unit PCB. This prevents the system from accurately reading ambient outdoor temperatures.

• Damaged outside air temperature sensor (ThoA).
• Loose or 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.