When your heat pump is turned on and operating but failing to heat your living space, the problem frequently stems from a stuck reversing valve, a malfunctioning defrost cycle, or severely restricted airflow. If the reversing valve is stuck in the cooling position, hot refrigerant cannot reach the indoor coil. If ice coats the outdoor unit and the defrost board fails, the unit cannot extract heat from outdoor air. Additionally, a clogged indoor air filter restricts heat transfer, while low refrigerant levels reduce thermal capacity. In freezing weather, failure of backup electric auxiliary heating strips can also leave your home cold. You can verify the root cause by observing outdoor unit icing, checking airflow at indoor supply vents, and ensuring thermostat settings are correct.
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