Error 39 — Condensing temperature sensor malfunction

What does 39 mean?

An electrical failure has occurred with the sensor that measures the condensing temperature of the outdoor coil. This sensor connects to the PCB via two wires at Plug CN-14.

• Loose sensor connection
• Open or shorted sensor
• Sensor is out of calibration
• Faulty sensor wiring

Click steps to track your progress.

1. 1

   Check the connection at Plug CN-14 for the condensing temperature sensor.

2. 2

   Inspect the sensor wiring for damage.

3. 3

   Test the sensor resistance against calibration tables.

4. 4

   Replace the sensor if faulty or out of calibration.