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Furnace Won't Fire - Suggestions?

707 Views 7 Replies 4 Participants Last post by  rootboy
I have an American Standard 90 furnace. I just moved in a few weeks ago and we fired it up with no problem. About a week ago, it stopped putting out hot air and would only blow cold. I quickly learned that it wasn't firing and thus.....cold air. I pulled the filter and noticed it was completely plugged. I have tried replacing the pressure sensor switch with no luck, tried resetting the main limit switch and the flame rollout switch. I am assuming the furnace overheated, but not sure how to get it to come back to life. BTW, the heat inducer fan powers up until the furnace tries to fire, then it shuts down. I never get a pilot or any flame. Thanks
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There's more than one limit switch. Some you can not reset, some need replacing, but it sounds like ones tripped.
blower housing, some draft inducer motor housings (mostly on newer high seer furnaces), there's usually two flame roll outs on the burners somewhere..
Then I don't what else to tell you other than to call an hvac company out to find it for you.
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