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Outer unit produce ice after tempreture 21 - Haier ESA3125 Wall/Window Air Conditioner

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Hi, what you have is called a Heat-Pump, and it also has a reversing valve that reverses the flow of freon through the unit. In the winter time, the outdoor unit becomes the evaporator coil and the indoor becomes the condenser coil. You have what is called a defrost board and also defrost thermostats on the outdoor unit. When the unit starts to build up ice on it, it has a defrost timer and along with the stats will terminate a defrost and melt the ice away. You should see the fan shut down and the unit will start to throw off steam, almost looks like smoke. Ice is a normal thing to happen on heat-pumps as long as it goes through a defrost cycle every so many hours to keep the ice from getting real thick and the unit stops heating your home. So, if your not having heating problems, and the ice does not keep building and getting thicker and thicker, this is normal, and there is nothing for you to worry about. If you have any more questions, feel free to contact me and I will help you out. Please don't forget to rate this post for me, as I know you will be kind.
A/C, Heating, & Refrigeration Contractor

Posted on Sep 24, 2010

  • Virginia Bone
    Virginia Bone Nov 23, 2013

    My outdoor unit has ice build up but the fan is still running. I have been out to check it when the fan turns off but the compressor is still running (which I assume is the defrost cycle), however, the outter casing still has ice build up and I don't see steam coming from the unit. Is it possible to warm up the coil and not melt the ice from the outter case? There is only a 3 inch section of the combs that do not have ice on I have an issue with my defrost board? I have used water to melt a large portion of the ice off the combs and then the frost/ice comes back (which I know is supposed to be normal...but it never melts off during the defrost cycle). It is an older unit (probably at least 10 yrs old)


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