Outdoor Unit Malfunction

What does U1-UP mean?

This range of codes (U1 through UP) indicates a general malfunction within the outdoor unit, as displayed on the remote controller LCD. For specific diagnostic details, further reference to the detailed error code list in the manual is required.

• Malfunction of the outdoor unit's compressor control system.
• Failure in the outdoor unit's refrigerant flow control valve.
• Abnormal sensor readings from the outdoor unit (e.g., temperature, pressure).
• Loss of communication signal from the outdoor unit's main controller.

Click steps to track your progress.

1. 1

   Refer to the 'Error code list' in section 'V.4.2.Error code list' of the complete manual for specific diagnostic information related to U1-UP codes.

2. 2

   Visually inspect the outdoor unit for any signs of damage, loose electrical connections, or abnormal sounds during operation.