Your heat pump's outdoor unit has detected a problem with the sensor that monitors the temperature of the refrigerant gas as it leaves the compressor, causing the system to stop running to prevent damage.

Outdoor Unit, Discharge Thermistor (Tp) Error

What causes this fault?

This fault occurs when the control system receives an incorrect or missing signal from the sensor that monitors the heat of the refrigerant gas. It often happens because the sensor has failed internally, or because the electrical wiring connecting it to the main circuit board has become loose or damaged. To prevent the unit from overheating and causing expensive internal damage, the system safely shuts itself down.