Help needed with Ducane furnace..

Old 04-08-11, 04:04 PM
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Help needed with Ducane furnace..

I have a Ducane furnace and by the way it's acting, I'm 99.99% sure the thermocouple needs replaced. I don't have a voltage regulator to test it. I mostly would like to be able to put in the model and serial number somewhere and find a schematic of this furnace and/or list of parts. Perhaps it has a spark igniter instead of a thermocouple? or flame sensor? or ?? I know the natural gas part of the furnace is working correctly. The pilot light is on. I can hear the furnace come on and see the pilot light. I can hear it roar and additional "flame on" type thing happen. Then sometimes the fan kicks in and sometimes it doesn't. Sometimes the fan stays on and blows warm air around the house and sometimes it doesn't. Thanks for any assistance you can give!!
Old 04-08-11, 05:33 PM
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You need to take the cover off the burner compartment of your furnace and carefully observe and report the sequence of events that happens when you turn the thermostat up.

Check to see if you have a standing pilot light that stays lit when the thermostat is turned down and is not calling for heat.
Old 04-09-11, 08:37 AM
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If your furnace is old enough to have a standing pilot, there's a good chance that it also has a fan/limit switch. Sounds like that may be sticking...

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