Outdoor unit does not operate — Outdoor thermistor fault detected

What does Outdoor thermistor fault mean?

The outdoor unit is not operating due to a detected short or open circuit in one of the outdoor temperature thermistors. This includes thermistors for discharge temperature, fin temperature, defrost, P.C. board temperature, outdoor heat exchanger, or ambient temperature.

• Discharge temperature thermistor shorted or opened
• Fin temperature thermistor shorted or opened
• Defrost thermistor shorted or opened
• P.C. board temperature thermistor shorted or opened
• Outdoor heat exchanger temperature thermistor shorted or opened
• Ambient temperature thermistor shorted or opened

Click steps to track your progress.

1. 1

   Turn off the power to the outdoor unit at the circuit breaker for at least 30 seconds.

2. 2

   Restore power and try to operate the unit again.

3. 3

   If the unit still does not operate, a qualified technician should inspect and test the outdoor thermistors.