F1 — Outdoor ambient temperature sensor error (T4 malfunction)

What does F1 mean?

The outdoor ambient temperature sensor (T4) is not functioning correctly. This sensor provides data about the outside air temperature to the system.

• Faulty outdoor ambient temperature sensor (T4)
• Loose or damaged wiring to the sensor
• Problem with the outdoor unit's main control board

Click steps to track your progress.

1. 1

   Ensure the outdoor ambient temperature sensor (T4) is clean and unobstructed.

2. 2

   Check the wiring and connections of the sensor to the outdoor unit's control board.

3. 3

   Verify the sensor's resistance value against the specifications in the manual.

4. 4

   If the sensor is faulty, replace it. If wiring is good, the control board might need attention.