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Heat pump keep freezing up?



Heat pump issues, such as the coil freezing up, can quickly hamper heating and cooling performance and place strain on other components. If ice accumulation has occurred on the outdoor coil (heating mode) or indoor coil (cooling mode), use these tips to see if you can remedy the problem before calling your trusted JC Mechanical technician.

Heating Mode
Air-source heat pumps provide heating and cooling for the home by manipulating refrigerant with pressure changes to extract, move and release heat energy. In heating mode, the refrigerant inside the indoor coil becomes exceedingly hot and transfers heat energy to indoor air. The outdoor coil, in heating mode, becomes exceedingly cold in order to absorb heat energy from very cold winter air.
However, the cold outside coil isn’t the reason for ice accumulation. These are common causes and troubleshooting tips:

Airflow – The coils must receive free airflow to instigate heat exchange by the refrigerant. Make sure the outside unit doesn’t become covered with ice, snow or any other debris. A lack of airflow across the coil will cause ice accumulation.

Refrigerant – Incorrect refrigerant charge, either too much or too little, causes ice accumulation. Call your JC Mechanical to remedy this issue.

Demand defrost – It’s possible that the demand defrost mode isn’t functioning correctly, which is another issue for a JC Mechanical professional. There may be a faulty reversing or relay switch.

Cooling Mode
In cooling mode, the heat exchange and refrigerant temperatures reverse. The indoor coil becomes exceedingly cold and absorbs heat energy from indoor air to cool it. Again, however, this isn’t why the indoor coil freezes up.

Airflow – Check the air filter. A clogged air filter blocks airflow and causes the condensate on the indoor coil to freeze. Soon, there’s a snowball effect and your house begins to heat up. Turn off the heat pump to allow the ice to melt.

Electrical contacts – Worn electrical contacts stress the compressor and other components, which can create ice accumulation.

We are always here for any of your HVAC needs! Call JC Mechanical today at 615-440-6687 and rest easy knowing we will take the best care of you and your family!


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We offer 24/7 Emergency Service to all of our customers. You can always count on AirPro Experts to get to you fast and get the job done right the first time. We use state-of-the-art diagnostic equipment to find the source of your heating and air conditioning problems and fix them fast.