Your heat pump freezing up on a cold Baltimore winter night or hot summer afternoon is a frustrating situation, but not always a complex one. By checking for the most common causes of freezing, you’ll know if the problem is something you can solve or if you’ll need a professional.

Impaired airflow – Without sufficient airflow, the temperature of the refrigerant in the heat pump’s condenser and evaporator coils falls below freezing. This causes the moisture on these coils to freeze. Check that none of your supply air registers are blocked by furniture, rugs, drapes or other items. Clear away leaves, grass clippings and other debris on or around the outdoor unit. If your air filter looks dirty, replace it with a new one.

Power-saving setting – Running your system on this setting shortens the defrost cycle and is a possible cause of a heat pump freezing up. To prevent this, stick with the manufacturer’s operating specifications.

Cold rain – In cold weather, rain on your outdoor coil can cause ice buildup. To defrost your system, try running the fan (without heat) on the exhaust setting.

Low refrigerant – Too little refrigerant lowers the pressure in your heat pump system, which can cause freezing. Heat pumps don’t “use up” refrigerant, so low refrigerant suggests your system has a leak that will need professional care.

Settled concrete slab – Your outdoor unit sits on a concrete slab designed to keep the unit level. This slab can settle into the ground and tilt so the unit becomes uneven, interfering with the drainage of ice melt. If your outdoor condenser/compressor looks uneven, contact a heating and cooling professional.

Damaged defroster – If your heat pump’s defrost cycle won’t start, try moving the ice sensor on the outdoor unit closer to the air intake area. If this doesn’t help, the sensor or the defroster might be damaged.

If your heat pump freezing up is a regular occurrence or you suspect your system needs professional care, contact us at Griffith Energy Services, Inc. for help. We provide dependable expert services around Baltimore, Frederick, and Manassas, as well as in and around Dover, Del., and Martinsburg, W.Va.

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Dear Customers,

At this time, when the news is dominated by the Coronavirus (COVID-19) health emergency around the world, we wanted to personally reach out and let you know that we are vigilantly implementing enhanced protocols to ensure your safety and the safety of our team.

We are closely monitoring the guidance of the World Health Organization and the Centers for Disease Control regarding the spread of the virus. This is an evolving situation and we will continue to develop and take necessary measures as needed. Our focus is to ensure that we meet customer needs while doing our part to keep you, our employees, and our communities safe.

Here’s what we’re doing:

  • Everyone on our team has received enhanced training and protocol briefings. We will continue to evolve and adjust these protocols as needed.
  • We are implementing telecommuting options for positions where applicable.
  • Non-essential work travel is currently on hold for all employees.
  • We are conducting enhanced cleaning practices at our locations and are instructing employees to continually sanitize their work stations and vehicles.
  • We are also urging all employees to be vigilant about frequent hand washing.

Information for you:
If you have an existing service appointment, we look forward to seeing you and want to reassure you that we are doing everything we can to promote a safe and secure service experience.

During this challenging time, if you are experiencing symptoms related to the COVID-19 virus or have been exposed to it, in order to protect our team and all the customers we serve, we encourage you to please reschedule your service appointment, by calling us at 888-474-3391.

Your safety is our highest priority and we truly appreciate the trust that you place in our team and our company.

Best regards,
Griffith Energy Services

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