Error 428 - Compressor stop due to abnormal compression ratio

What does 428 mean?

The compressor has stopped because the system detected an abnormal compression ratio, indicating an issue with how the refrigerant is being compressed.

• Refrigerant overcharge or undercharge
• Faulty compressor or its internal components
• Problem with the expansion valve

Click steps to track your progress.

1. 1

   Verify proper refrigerant charge in the system; this requires professional equipment.

2. 2

   Check for any obstructions or restrictions in the refrigerant lines.

3. 3

   Consult a qualified technician to inspect the compressor and expansion valve if the issue continues.