Upper lamp blinks 2 times - Thermistor issue (Indoor coil or Room temperature)

What does 2-time blink (2.5-second OFF) mean?

The upper operation indicator lamp blinks twice with a 2.5-second pause. This indicates a short or open circuit in either the indoor coil thermistor or the room temperature thermistor.

• Indoor coil thermistor failure
• Room temperature thermistor failure
• Wiring fault to either thermistor

Click steps to track your progress.

1. 1

   Refer to the characteristics of the indoor coil and room temperature thermistors in section 10-7.

2. 2

   Inspect the wiring and connections for both thermistors.

3. 3

   Replace the faulty thermistor.