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This looks like a newer “vent “ & exhaust, I haven’t seen one quite like that but it looks like a coaxial vent & air supply for a closed system. I wonder if it is rain or a plugged condensate drain that is the problem because that small area would require much more rain to provide what I think you reported even at biblical proportions, I don’t think ...


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Bad grounds on ignitors are gremlins. Check your ignitor grounds.


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I just finished replacing the GE motor in my unit with a Mars blower motor. I had the same issue, one extra wire. But there’s a chance the orange wire is actually the common wire and the yellow is one of the two med settings (med hi or med lo). That turned out to be the case in my unit. On my new motor, I had black, red, blue, and yellow. On the old one, it ...


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I am not so sure that the Common of the transformer connects to terminal TH of the ignition control module. It looks more like the TR terminal and it looks like another terminal is labeled TH. I would encourage you to locate the wire join point depicted below and add your C wire into the existing 3 wire join to make it a 4 wire connection. If you are lucky ...


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The contacts in the thermostat for the "fan on" are different than for the "fan auto". If you know what type of thermostat you have you should be able to find a wiring diagram and determine which wires to short out on the mounting block to simulate "fan on". In my thermostat, it's red and green but you'd have to verify that with yours. You could also remove ...


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