Error 123 — EVA OUT sensor error (Short or Open)

What does 123 mean?

The evaporator outlet (EVA OUT) temperature sensor in the indoor unit is experiencing a fault, indicated by a short or open circuit. This impacts the system's ability to properly control refrigerant flow.

• Defective EVA OUT sensor
• Compromised sensor wiring
• Improper sensor connection
• Fault on the main control board

Click steps to track your progress.

1. 1

   Disconnect power to the indoor unit at the breaker panel.

2. 2

   Visually examine the EVA OUT sensor and its wiring for any signs of wear, cuts, or loose plugs.

3. 3

   Confirm the sensor is properly seated in its mounting location and its electrical connector is firm.

4. 4

   Restore power to the unit. If the wiring appears intact and connections are secure, the sensor itself might be faulty.

5. 5

   Contact a professional to diagnose and potentially replace the sensor.