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Old 01-17-2011, 02:18 PM   #1
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Furnace is cycling two times in a row


It's a coleman furnace model number DGAT070BDF. Not all the time but I would say around half the time when the furnace comes on it will cycle and go to shut off and then cycle again right away. From what I can tell the burner only comes on during one of those cycles, some times it's on during the first one and sometimes it's on during the second cycle but haven't seen it on during both cycles.

I replaced the thermostat because we wanted a programable one anyway and that didn't help anything. I also tried replacing the pressure switch and that didn't help at all. I have a fluke and know how to use it but just not sure what I should be testing in the furnace.

My thoughts right now are leaning towards one of the limit switches but that is just a guess and I would like to avoid just throwing parts at it. So any help of things to test to try and narrow it down would be much appreciated.

Thanks, Scott
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Old 01-17-2011, 02:44 PM   #2
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Furnace is cycling two times in a row


Well, for one it falls under this 2004 Recall with CPSC.gov http://www.cpsc.gov/cpscpub/prerel/prhtml05/05047.html Do you know if it was repaired under the recall? It appears that the recall was because of Cracked Heat Exchangers http://www.wowt.com/news/features/4/1197681.html
http://www.mobilehome.com/phorum5/re...?8,79014,79014

Last edited by gregzoll; 01-17-2011 at 02:46 PM.
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