Error 440 - Heating mode restriction due to high air temperature

What does 440 mean?

The system has restricted heating mode operation because the ambient air temperature is too high for efficient or safe heating.

• Outdoor temperature exceeds the operating limits for heating mode
• Faulty outdoor temperature sensor providing incorrect readings

Click steps to track your progress.

1. 1

   Check the current outdoor ambient temperature; this is a normal protective measure at high temperatures.

2. 2

   Ensure the outdoor unit's temperature sensor is clean and unobstructed.

3. 3

   If the outdoor temperature is appropriate for heating and the error persists, a technician may need to check the sensor.