When you notice ice building up on your outdoor heat pump condensing unit during the winter heating season, you should first determine whether it is a normal occurrence or a mechanical fault. A light layer of frost or thin ice is entirely normal during freezing weather, and your heat pump's automatic defrost control board should kick in every thirty to ninety minutes to melt it away by briefly reversing the refrigeration cycle. However, if the outdoor unit is encased in a thick, solid block of ice that persists for hours, it indicates a malfunction, such as a failed defrost sensor, a stuck reversing valve, blocked outdoor airflow, or low refrigerant levels. To address severe icing safely, switch your thermostat to emergency heat to engage backup auxiliary heating, and gently pour warm water over the coil to melt stubborn ice while avoiding sharp tools that could puncture the delicate copper tubing. You can verify resolution when defrost cycles clear ice.
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