My fan and gas shuts off after only a few minutes in the heating cycle and restarts again shortly, only to shut off again... and so on. I think it's the fan limit switch but don't know if I should replace it or try adjusting the limit. Any advice??

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Originally Posted by crmiller

My fan and gas shuts off after only a few minutes in the heating cycle and restarts again shortly, only to shut off again....and so on. I think it's the fan limit switch but don't know if I should replace it or try adjusting the limit. Any advice???

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Hello,,
This was happening to me on my carrier furnace, and also it would not even start the blower, my problem was a bad motherboard after the heating contractor replaced some sensors and switches, hope this helps

Dirty flame sensor, overheating? Could be something else.