F3 — Compressor discharge temperature sensor error

What does F3 mean?

This error indicates a malfunction with the compressor discharge temperature sensor (T5). This sensor monitors the temperature at the compressor's outlet.

• Faulty compressor discharge temperature sensor (T5)
• Open circuit or short circuit in the sensor wiring
• Loose connection to the main control board

Click steps to track your progress.

1. 1

   Check the connections of the compressor discharge temperature sensor (T5) to the outdoor unit main control board.

2. 2

   Inspect the sensor wiring for any open circuits or short circuits.

3. 3

   Check the resistance value of the compressor discharge temperature sensor against the specifications in the manual.

4. 4

   If the sensor resistance is abnormal, replace the sensor.

5. 5

   If the sensor and wiring are fine, consider replacing the outdoor main control board.