Display 403 — Compressor Freezing Detected (Cooling)

What does 403 mean?

During cooling operation, this error indicates that the outdoor unit's compressor has frozen.

• Low refrigerant charge
• Airflow obstruction
• Low ambient temperature during cooling

Click steps to track your progress.

1. 1

   Ensure there are no blockages to the outdoor unit's air intake or exhaust.

2. 2

   Check that the outdoor operating temperature is within the recommended range for cooling.

3. 3

   Allow the unit to defrost completely; this may take several hours.

4. 4

   If the issue recurs, contact a technician to check refrigerant levels and system airflow.