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Furnace shutting off

When we turn our furnace on it runs for about a minute or to then shuts off. It is igniting but it just wont stay on.

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Thanks for you question,
It will be one of two things, either you have a bad flame sensor, or a bad pressure switch, , the flame sensor is located infront of the burners, its a little rod that the flame impinges on when its lit, you may need to take it out, and clean it, use some emery cloth to clean it then reinstall it, give it a try and if your furance runs, then great, your pressure switch isnt to bad either, you will see one or two small pieces of tubing coming out of it, two possible three wires on the front of it, remove the switch, and take it to your local heating and a/c shop to get a replacement, there is no working on these, hopefully its the flame sensor, alot less trouble ! Hope that was helpful, thanks again for your question, please let us know how we did,
mr.grzz

Posted on Jan 21, 2009

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