Question about Fujitsu Heating & Cooling
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Posted on Jan 02, 2017
most likely a bad temp sensor on the outdoor coil. you are seeing ice so its cold enough to defrost but the sensor is not seeing ice so it doesn't. usually a generic 3/8 or 1/2 clamp on sensor will fix. you can freeze the sensor with a little r22 and it should close and fall into defrost or jump it and it has to proof closed and the unit should defrost. if you jump it you may have to speed up the board to diagnose. usually jumping test pins together throws it into a 5 sec in 20 seconds out cycle. kind of like turning a 24 hour days into 24 seconds. or to protect the board you can just find the sensor pull it, replace it and watch what happens next cold night. good luck
Posted on Nov 10, 2008
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