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Furnace stops before set temp is reached. continously cycles like this Therm ok, tested, bypased with same effect.

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Short cycling, could be because of gas pressure, drain issues from inducer and exchanger (if 90% plus furnace), auxilary limit getting to hot (dirty filters, obstruction, dirty coil), or your flame sensor is failing. Does the furnace lock out? or does it just cycle on and off? If it does how often? Thanks

Posted on Dec 06, 2008

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