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York hvac heat problem

I have a York D3CG 60 and two D2CG 120 s that answer the heat call, but the burners only cycle one time then they blow cold air until i shut the units off and restart them

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  • toutcons Jan 11, 2009

    I have the same problem.... however the high limits are new and have no air flow problem. I do wonder if this problem can be a result of a bad static pressure sensor??

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It could be that the flame is " Rolling out" of the burner compartment and hitting the safety device known as the "ROLL SWITCH" If this happens all the time you probably have a split / cracked heat exchanger or a heat exchanger that has holes in it. The holes allow the air pressure from the indoor blower to enter into the burner tubes and blow the flame back out of the burner compartment...not to mention allowing poisonous CO [ Carbon Monoxide ] to enter the air stream that goes into the heated space of the people down below. The holes don't have to be very big for this to happen and if the heat exchanger is split along the factory seam...it will be very heard to see unless you have the heat exchanger heated up for a while. Heat exchangers are the second most expensive part of a rooftop unit right after an A/C Compressor. they're not too difficult to change but you have to know what you're doing specifically when resealing all the sides and edges so CO doesn't leak out of a seam and kill everyone down below.

Posted on Mar 02, 2010

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Whats happenening is that the unit's nare probably going off on the high limits. Thats when the fans will run until they are cycled off manually. Check yor filters and the belts to make sure that you are moveiong enough air for the unit. theanks for usin Fixya.

Posted on Dec 23, 2008

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