E403 — Outdoor Unit Freezing Detected when Compressor Stops

What does E403 mean?

This error indicates that freezing conditions have been detected in the outdoor unit while the compressor is stopped. This could be due to issues with airflow or the electronic expansion valve (EEV).

• Outdoor unit fan or motor not operating normally.
• Malfunction of the Electronic Expansion Valve (EEV).
• Problem with the indoor unit heat exchanger temperature sensor.
• Blocked indoor unit air inlet.

Click steps to track your progress.

1. 1

   Turn off the air conditioner at the main power switch or circuit breaker and wait 30 seconds.

2. 2

   Check that the outdoor unit fan blades are not obstructed and can spin freely.

3. 3

   Ensure the indoor unit's air inlet is not blocked by furniture or curtains and that air filters are clean.

4. 4

   Restore power. If the error persists, contact customer support.