Error 440 — Heating mode restriction due to high air temperature

What does 440 mean?

Heating mode operation is restricted because the ambient air temperature is too high. The system prevents heating to avoid issues in such conditions.

• Ambient air temperature is excessively high
• Faulty outdoor air temperature sensor
• System safety protocol active

Click steps to track your progress.

1. 1

   Check the ambient air temperature readings.

2. 2

   Ensure the outdoor air temperature sensor is clean and correctly positioned.

3. 3

   Wait for the ambient temperature to decrease before attempting to operate in heating mode.

4. 4

   If the temperature readings seem incorrect, the sensor may need calibration or replacement.