If your heat pump is running continuously but failing to provide warmth to your home, several underlying mechanical or environmental problems could be occurring. During freezing winter conditions, heavy frost or ice buildup can coat the outdoor condensing unit coils, causing the system to lock out or enter a continuous defrost cycle that blocks heat production. A malfunctioning defrost control board or a stuck reversing valve can also trap the unit in the wrong operating mode. Furthermore, low refrigerant levels from a leak reduce heat transfer efficiency, while restricted airflow caused by a severely clogged indoor air filter chokes the system. If outside temperatures drop below the heat pump's balance point, auxiliary heating strips may be required. You can verify proper operation by checking outdoor coil icing and confirming that supply air temperature rises.
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