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Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. First I’ll need some more info so I have a more complete picture of your situation. I need a wiring diagram for your unit. It's usually pasted to the back of one of the access panels. Post a clear sharply focused pic here. Click on link below for pic upload instrutions
I'm going to open this up to my colleagues so one of them can help. Please don't respond (even to acknowledge this post)until you get a response from us. If you respond first it will only delay your answer.
Hello, send me a photo of the limit switch with the three wire terminal connections that were used on it... then tell me where each of the three spare wires terminates in the furnace.... (blower motor and gas valve etc) we can go from there.