Question about Honeywell Lennox Armstrong Ducane Control Circuit Board 1097-502-i 1097-83-503a

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Ducane Furnace; control board keeps blowing fuses as soon as disconnect is plugged in

Nothing yet just searching for suggestions this really has me puzzled I just the wiring and everything checks out

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Could be a bad earth or faulty switch

Posted on Nov 21, 2014

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there are generally two control boards, I am assuming you looked at the lower one. I would first disconnect the power leads at the board and see if it still blows the circuit breaker (fuse?). If it does the check wiring for short. If OK then reconnect power leads and then disconnect all other wires (plug-ins) to the board and try again, each time plug a connection in and retry. (remember to disconnect power each time). I have a feeling the smoke got let out of this lower board and may need replacement. hope this helps
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1 Answer

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1 Answer

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Sounds like crossed or shorted wire going to the thermostat. Disconnect the wire from the thermostat and see if it shuts off. If it does, it is the thermostat. Then disconnect either the white wire or red wire at the control board and see if the furnace shuts off. If it does, its the wiring. If it continues on, it is the control board. Remember you will need to tape the access panel door switch to the on position to be able to run the furnace with the panel off.

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