Error E6 / Indoor Red LED Flashes Once — Indoor heat exchanger sensor fault

What does E6 / Indoor Red LED 1 flash mean?

Error E6, indicated by a single flash of the indoor unit's red LED, means the indoor unit's heat exchanger sensor (ThIR) is defective, either due to an open or closed circuit, or has a poor connection to the indoor PCB.

• Indoor unit heat exchanger sensor (ThIR) defective (open or closed circuit)
• Poor connection of sensor connector on the indoor PCB

Click steps to track your progress.

1. 1

   Turn off the air conditioner's power supply at the breaker.

2. 2

   Carefully check the connection of the heat exchanger sensor (ThIR) to the indoor PCB, ensuring it is secure.

3. 3

   If comfortable, gently disconnect and reconnect the sensor to reseat it.

4. 4

   If the error persists after checking the connection, the sensor may need replacement by a professional technician.