E407 — High Pressure Switch error or connector open

What does E407 mean?

The high-pressure switch has an error or its connector is open, indicating a potential issue with refrigerant pressure.

• Compressor pressure is too high
• The connector CN003 on the MAIN-OUT PBA is open or loose
• Faulty high-pressure switch

Click steps to track your progress.

1. 1

   Power off the unit at the circuit breaker for 30 seconds, then power it back on.

2. 2

   Consult a qualified technician to check the connection of the CN003 on the MAIN-OUT PBA.

3. 3

   A technician should also check the compressor pressure to ensure it is within safe operating limits.