Your heat pump has detected an electrical fault within the wiring or the motor that drives the system, causing it to shut down to prevent damage.

Compressor Stall Error, Compressor Start Error, Compressor Terminals Short Circuit, and Compressor Error

What causes this fault?

This fault occurs when the electrical current flowing to the heart of the heat pump is interrupted or takes a dangerous shortcut. It is most commonly caused by damaged internal wiring or an electrical failure within the compressor motor itself, which triggers a safety shutdown. Over time, vibration or moisture can wear down the insulation on these components, leading to this electrical malfunction.