Common Reasons Why an Air Conditioner Fails to Heat Completely

An air conditioner that fails to heat completely is often related to mode settings, hardware malfunctions, or environmental factors.

First, incorrect mode selection is the most basic cause. If the air conditioner is set to cooling, fan, or dehumidification mode, the compressor will not start the heating program, so it cannot blow hot air. Second, hardware failures directly lead to loss of heating function. For example, a damaged compressor, a stuck or faulty four-way valve will prevent the air conditioner from switching between cooling and heating cycles; a malfunctioning temperature sensor will cause the air conditioner to misjudge the indoor temperature and stop heating.

In addition, environmental factors should not be overlooked. When the outdoor temperature is too low, the heating efficiency of heat pump-type air conditioners will drop significantly or even shut down. If the outdoor unit's heat exchanger is frosted and the defrosting function is abnormal, it will block the heat exchange channel.

Furthermore, long-term failure to clean the filter causing blockage, and refrigerant leakage, will also make the air conditioner lose its heating capability.