5109 - HIC pipe temperature thermistor (TH2) open/short

What does 5109 mean?

An open or short circuit has been detected in the HIC (Heat Interchanger) pipe temperature thermistor (TH2). This will cause the air conditioning system to automatically stop operating. This error code may be related to delay code 1222.

• Faulty HIC pipe temperature thermistor (TH2).
• Loose thermistor connection.
• Damaged wiring to the thermistor.

Click steps to track your progress.

1. 1

   Note the 5109 code displayed on your remote controller or the outdoor unit's LED.

2. 2

   Turn off the main power supply to the outdoor unit at the circuit breaker.

3. 3

   Wait at least 1 minute after LED1 and LED2 on the outdoor circuit board go out, then turn the main power supply back on.

4. 4

   If the error persists, contact a qualified service technician to inspect and test the HIC pipe temperature thermistor.