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Frost on my heat pump

I've never had a heat pump before and I am wondering is there supposed to be so much frost on the "fins"? It has been heating for a couple months with our outside temps running in the 20 to 40 dogree range. House is set at 65. I just worried if it builds up too much it will fry the pump. Any info. wouuld be helpful. Thanks.

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All you are seeing is the moisture in the air outside starting to freeze on the fins there is no worries the system has a cycle time built in to check for freezing and will defrost itself if it does not thaw out it has a bad sensor or board

Posted on Nov 16, 2008

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I just moved into this home and am wondering what EM heat is compared to just Heat and my outside unit is full of frost what do I need to do?


Hi, EM stands for emergency heat. You should only need to use it if the outdoor unit does not operate. You have what we call a heat-pump. If the outdoor coil is iced up, it should go into a defrost cycle to melt away the ice. You will know when it does as you will see steam coming up from the unit as though it is on fire. The outdoor fan will also shut down during this process. These units will defrost using time and temperature to defrost the coil. If the ice continues to build-up, and does not defrost every couple of hours, I would say you have a faulty defrost board or defrost thermostat. There is not alot you can do as these are very complicated systems to work on. You will more then likely have to call out a service tech to check this outdoor unit for you.It also should have heat strips in the outdoor unit for EM heat if the outdoor unit fails. If it is iced up it is on and running. Thats what I would do is keep an eye on it to see if it does defrost, and if not, you will need to get a tech out to check it. It takes special equipment to check these units. Please keep me posted.
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1 Answer

No water in bucket


possible that the cooling fins have frosted over...this happens when a cold surface appears in a humid room that does not have enough heat to prevent the freeze-up on the fins. If you look at the fins (above the water bucket), you may see the frost. One solution is to turn up heat in room, followed by placing a fan to blow air through fins if still frosted. If you do not have a frost problem, then ensure compressor is running. If comp is running, then return dead unit.

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