Outdoor Board LED1 (green) blinks three times and LED2 (red) blinks two times alternately - Abnormality of shell thermostat and discharging temperature (TH4)

¿Qué significa U2 ?

During startup or operation, the outdoor unit's LED1 (green) blinks three times and LED2 (red) blinks two times alternately, indicating an abnormality of the shell thermostat and/or discharge temperature sensor (TH4).

• Abnormality of shell thermostat and discharging temperature (TH4).
• Connectors (TH4, LEV-A, and LEV-B) on outdoor controller board are disconnected.
• Insufficient refrigerant in the unit.

Haga clic en los pasos para seguir su progreso.

1. 1

   Check if connectors (TH4, LEV-A, and LEV-B) on the outdoor controller board are not disconnected.

2. 2

   Measure resistance values among terminals on indoor valve and outdoor linear expansion valve using a tester.

3. 3

   Check if the unit is filled with the specified amount of refrigerant.

4. 4

   Ensure the shell thermostat is properly seated and functioning.