Error 151 - Opened EEV of indoor unit (2nd detection)

What does 151 mean?

The electronic expansion valve (EEV) in the indoor unit is detected as being open, preventing proper refrigerant flow control. This is a persistent issue (second detection).

• Faulty EEV
• Control signal issue to the EEV
• Refrigerant imbalance or obstruction

Click steps to track your progress.

1. 1

   Power cycle the indoor unit to attempt a reset of the EEV's control system.

2. 2

   Verify the EEV's wiring connections for any looseness or damage.

3. 3

   If the error persists, it indicates a more serious issue requiring a qualified technician to diagnose the EEV or refrigerant system.