If not, read the next section about common heat pump malfunctions. 7 common reasons a heat pump blows cold air BEFORE READING FURTHER: Watch this video on how a heat pump works. It will make all our explanations make way more sense. 1) Dirty outside unit In heat mode, the heat pump's outdoor unit uses liquid refrigerant to absorb heat from.. In that case, the thermostat won't activate the heating cycle, and the furnace won't blow hot air. So, begin your troubleshooting by ensuring the thermostat is set correctly. Try turning the temperature about 10°F (5-6°C) higher than the current reading and wait to see if the furnace will start to heat.
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When your heat pump isn't blowing hot air, one of these seven issues is likely to blame: 1. Low Refrigerant or Refrigerant Leak. Low refrigerant levels can significantly hamper your heat pump's ability to produce warm air. Refrigerant is the lifeblood of the system, responsible for absorbing and releasing heat.. A neglected filter can cause a furnace to blow cold air because it overheats and tries to cool itself by blowing cool air through the ducts and into the home. How to fix: Install a new filter, restart the system, and check the air from the vents. It will run cold at first because there is still cold air in the ducts, but the air should warm.
