EC53 — Outdoor ambient temperature sensor (T4) malfunction

What does EC53 mean?

The outdoor ambient temperature sensor (T4) is malfunctioning. This sensor provides crucial data about the outside air temperature.

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

Click steps to track your progress.

1. 1

   Check the wiring and connections of the T4 sensor.

2. 2

   Ensure the sensor is unobstructed and clean.

3. 3

   Measure the sensor's resistance and compare it to the values in the manual.

4. 4

   Replace the sensor if necessary; otherwise, the control board might be faulty.