Error E37 / Outdoor Red LED Flashes Once — Outdoor heat exchanger sensor fault (general)

What does E37 / Outdoor Red LED 1 flash mean?

Error E37, indicated by one flash of the outdoor unit's red LED, signifies a general fault with an outdoor unit heat exchanger sensor (ThOR). This could be due to a defective sensor or a poor connection.

• Outdoor unit heat exchanger sensor (ThOR) defective (resistance is open circuit)
• Poor connection of sensor connection on outdoor unit PCB

Click steps to track your progress.

1. 1

   Turn off the main power to the outdoor unit.

2. 2

   Inspect the connections of the outdoor heat exchanger sensors to the PCB.

3. 3

   Ensure all sensor connectors are secure and free from corrosion.

4. 4

   If the connections seem fine, the sensor itself may be faulty.

5. 5

   Contact a qualified technician for further diagnosis and sensor replacement.