what will cause my heat pump to freeze up

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Things that can cause a heat pump to freeze up are:Low refrigerant level or refrigerant leaks. To determine this you would need to attach refrigerant manifold gauges and use the superheat or subcooling method to check the charge.A bad heat pump defrost control board. The defrost control board might be bad and not activating the defrost. …A bad heat pump thermostat or thermistor. Please click here if you would like to see the heat pump defrost thermostats that we sell.A bad or sticking reversing valve. We have a really good YouTube video below that shows how a reversing valve works.A slow or dragging outdoor or indoor fan motor. Make sure the motor capacitors are in good condition. …Any kind of restricted airflow on the outdoor unit like maybe a garbage bag has blown up against the outside of the unit. …Broken gutters that allow water to drop down on the heat pump. …

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