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M y furnace cycles on and off quickly after being on for a little while and trying to get up to temp. Intertherm MAC 1165 ( SN# n1165 Mac8 AR12 11). Any ideas would be great. I've seen in other posts that it could be the fan/limit switch. can you maybe help me find the right one?

First make sure there are no blockages in burner orifice and/or spud (spiders-web-bugs).



Thanks,
Robert