C422 - EEV or valve close error-self diagnosis

What does C422 mean?

The electronic expansion valve (EEV) or another internal valve has a detected error during self-diagnosis, indicating it may be stuck closed or malfunctioning.

• Faulty EEV
• Debris obstructing the valve
• Electrical issue with valve control
• Control board error

Click steps to track your progress.

1. 1

   Turn off the air conditioner at the main power supply, wait 5 minutes, then restart.

2. 2

   Observe if the unit's cooling or heating performance is severely impacted.

3. 3

   If the error persists, contact a qualified service technician to inspect the EEV or other valves.