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In AUTO; blower won't come on when i turn heater/AC on.

I have a york 2 stage heater; when i turn the heater on in AUTO the blower won't come on. only when i switfch the fan to ON and then turn the heater on then it works. but then the blower is always on.
what could be the problem?

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Most likely the heating speed relay on your furnaces IFC board has failed.Unfortunately the entire IFC must be replaced to repair this. you are in need of a professional service tech. The same control handles the blower fan, ignition system and safeties. Not a do-it-yourself repair as wires in the wrong place could cost you a house.

Posted on Dec 18, 2008

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