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Ice on the outside coil !

I've replaced the defrost board and now I'm still getting ice on it, and the test pin will not send it in defrost ?

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Sounds like a heat pump.
The board should have a way to set the frequency of defrost cycles.
The unit should check the temp of the coil sensor when going into defrost. If its at the correct temp., it goes into defrost mode. If not, it will go into defrost for about 30 seconds and then back into the heat mode. I would look into the sensor. It is usually located on the inside of the outside coil at the bottom. Usually has 2 wire leading to it. It will probably be wrapped in some type of insulation tape.
Good Luck and I hope this helps.

Posted on Mar 08, 2009

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