Your heat pump has stopped working because a sensor detected that the internal system is getting too hot, likely due to a lack of proper airflow or low refrigerant levels.

Compressor Discharge Temperature High Error

What causes this fault?

This fault occurs when the temperature of the gas leaving the compressor becomes dangerously high, causing the system to shut down to prevent internal damage. It is usually caused by the system struggling to move heat away efficiently, often due to a leak in the refrigerant gas or a mechanical part failing to regulate the flow correctly.