Operation LED blinks 2 times and Timer LED blinks 2 times (02) — Room temperature thermistor error.

What does Operation 2 Times / Timer 02 mean?

The sensor that measures room temperature (thermistor) is detecting an abnormal temperature reading.

• The room temperature thermistor is open (disconnected) or shorted (faulty connection).
• The controller PCB is defective.

Click steps to track your progress.

1. 1

   Power off the unit at the circuit breaker.

2. 2

   Visually inspect the room temperature thermistor and its wiring for any visible damage or loose connections.

3. 3

   If the error persists after checking connections, a technician should check the thermistor's resistance or the controller PCB.