Frost is normal. Solid ice is not.
Usually airflow, low refrigerant or a failed defrost. Sometimes it is just normal winter frost. Here is how to tell.
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Why a heat pump ices up
- Dirty air filterRestricted airflow drops coil temperature and it freezes.
- Low refrigerantA leak means poor heat transfer, and the coil ices over.
- Defrost control failureIf defrost never kicks in, frost builds into solid ice.
- Blocked outdoor unitLeaves, snow or debris choke the airflow across the coil.
- Outdoor fan motor problemsIf the fan is not moving air right, the coil freezes.
- Icing in cooling modeThat points to low refrigerant or restricted airflow, never normal frost.
- Refreezes right after thawingUsually a refrigerant leak or a failed defrost control board.
- Runs nonstop without warming the houseTime for a diagnostic before it gets worse.
Before you call, check these
- Replace the air filterThe cheapest fix, and the most common cause.
- Clear the outdoor unitLeaves, snow and debris off the coil. Do not chip at the ice.
- Check the thermostatConfirm it is set to heat and to a normal temperature.
- Listen for defrostThe fan stops and it hisses or steams for a few minutes. That is normal.
- Fully iced over? Turn it offLet it thaw on its own. Never pour hot water on it. If it ices again quickly, call me.
Why it happens more here
Oklahoma winters bring a lot of damp, near-freezing days, and that is exactly when frost forms fastest. Regular maintenance keeps the defrost system and airflow in shape. Most heat pumps should be serviced twice a year, before cooling season and before heating season.
Repair
Find the cause, whether that is charge, defrost board, fan or airflow, and fix it right.
Service call $210 flatHeat pump repairMaintenance
Two visits a year, coil cleaned, defrost and charge checked.
Plans from $199 a yearMaintenance plansReplace
If it keeps freezing and it is getting old, I will tell you whether it is worth fixing.
Estimate freeReplacement optionsPrefer to watch? I recorded a two-minute answer on what causes ice on the unit and what to do first.
The numbers behind the work
Straight answers
Why is my heat pump icing up?
In cooling mode, icing means low refrigerant or restricted airflow. In heating mode below about 35 F, light frost on the outdoor coil is normal, and the defrost cycle should clear it every 30 to 90 minutes. Solid ice covering the unit in any mode is not normal.
Is frost on my heat pump normal in winter?
Yes. Some frost on the outdoor coil in heating mode is completely normal, and your heat pump has an automatic defrost cycle. If it stays solidly iced for hours, or ices up in cooling mode, you need a tech.
What should I do if my heat pump is completely frozen over?
Turn it off and let it thaw on its own. Check your air filter while you wait. If it ices again quickly once it is running, you likely have a refrigerant leak or a failed defrost control board. Call 405-375-4822.
Should I pour hot water on my heat pump?
No. Hot water can damage components and create a safety risk. Turn it off and let it thaw.
How often should a heat pump be serviced?
Twice a year for most heat pumps, before cooling season and before heating season.
What does a heat pump repair call cost?
A residential repair call is $210 flat: $99 dispatch plus $111 diagnostic, not credited toward the repair. You get a written repair price before any work starts.
Tell me what it is doing
Heating or cooling mode, how long it has been iced, whether it defrosts at all. Describe it and I will tell you straight what I think it is.
Call 405-375-4822Kingfisher, Hennessey, Okarche, Dover, Loyal, Cashion, Watonga and every town between. Counties: Kingfisher, Canadian, Oklahoma, Garfield, Major, Logan, Blaine.
