Why Is My Heat Pump Freezing up in Charleston, SC?

Heat pumps are a perfect HVAC option for homes in Charleston, SC. However, since they don’t work like conventional HVACs, they can exhibit behavior you don’t expect, like freezing up. Here are some of the things that can cause a heat pump to freeze up and what to do when they happen.

A Dirty Air Filter

In cooling mode, a heat pump works like a conventional air conditioner. Like an AC, its indoor coil can freeze when the system’s air filter gets too dirty. A clogged air filter blocks airflow over the coil, which can cause ice to form on its surface.

To avoid this problem, change your heat pump’s air filter as specified by your system’s manufacturer. That usually means installing a new air filter every 90 days or so. Keeping up with the required replacements will prevent further icing.

A Blower Motor Malfunction

A dirty air filter isn’t the only thing that can cause airflow problems and icing. Any malfunction of your heat pump’s blower motor can cause it, too. When the blower doesn’t operate at full speed, there isn’t enough warm air passing the coil to prevent icing.

A malfunctioning blower motor may also emit strange noises while it runs. Plus, you’ll notice a drop in airflow from your home’s vents. When either happens, contact us for a repair appointment.

A Refrigerant Leak

A refrigerant leak is one of the few things that causes icing in your heat pump’s indoor and outdoor units. It will cause icing on your indoor coil while your heat pump works in cooling mode. It will cause icing on your heat pump’s outdoor coil while it runs in heating mode.

If you suspect a refrigerant leak, it’s important to turn off your heat pump. Aside from its role in heating and cooling, refrigerant also carries lubricating oil to protect your heat pump’s compressor. A refrigerant leak requires professional repair right away.

If the heat pump in your Charleston, SC, home keeps freezing, don’t ignore it. Call M & B Heating and Air immediately to schedule a heat pump repair appointment.

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