Heat Pump Defrost Board Symptoms

During the cold winter months your heat pump s outside unit will sometimes be covered with a coating of frost on the sides or even light ice. In the winter heat pump icing up is often perfectly normal. Air conditioner circuit board troubleshooting question hello my name is calvin and i am an hvac technician that graduated from a community college 2 years ago and i am still learning and know i have much more to learn before i think of myself as an expert.

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Let the heat pump defrost itself if it s only covered with thin ice.

Heat pump defrost board symptoms. I have been running into a lot of circuit boards in air conditioners and heat pumps and i simply want to know what is the best way to. Every so often the unit will go into defrost mode to remove that frost. Here i diagnose a bad defrost board on a 1997 carrier heat pump. The defrosting relays make the cycle occur every 30 min or so.

Causes symptoms of heat pump not defrosting. Heat pumps come with a built in defrosting component that allows them to melt off accumulating frost during cold weather. The heat pump condenser operates below the dew point and collecting frost and ice on the heat pump condenser coils. If the pump is covered only with a layer of frost or with less than 1 16 inch 0 16 cm of ice it can defrost itself.

The defrost board controls the defrost in the colder months. The ice and frost on the heat pump condenser coils need to be removed. The next heat pump problem on the list is the heat pump defrost board. The heat pump should defrost regularly when the frosting occurs and should be long enough to melt all of the ice but short enough to avoid energy waste.

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