Your heat pump's internal power system is detecting an electrical surge or overload, causing the unit to shut down to prevent damage.

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What causes this fault?

This fault occurs when the brain of the heat pump detects a sudden electrical spike or excessive strain on the internal motor. This is usually triggered by a faulty control board sending the wrong signal or the compressor drawing too much power because it is struggling to start. In some cases, a loose electrical connection or moisture on the wiring can also cause this safety shut-down.