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Customer says sometimes at night the blower will continue to blow but the air will be cold. The heat works fine. I tried to test the defrost by jumping out the defrost sensor terminals and by jumping the test pins. It will go in and out of defrost a few times but will not stay in defrost during the test. I have tried removing the jumped test pin as soon as it goes into defrost. I have left the test pin jumped. I have pulled the jumper off the test pin 5-7 seconds after it being on there like suggested.
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Customer says sometimes at night the blower will continue to blow but the air will be cold. The heat works fine. I tried to test the defrost by jumping out the defrost sensor terminals and by jumping the test pins. It will go in and out of defrost a few times but will not stay in defrost during the test. I have tried removing the jumped test pin as soon as it goes into defrost. I have left the test pin jumped. I have pulled the jumper off the test pin 5-7 seconds after it being on there like suggested.
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source https://hvac-talk.com/vbb/showthread.php?2225615-Defrost-on-icp-package-unit&goto=newpost
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