Nordyne furnace blower

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Old 11-17-19, 09:07 PM
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Question Nordyne furnace blower

Hey good folks Iím new here and stoked to meet people and learn things! Iíve got an Ď80ís model Nordyne gas-powered downflow unit on which the blower only comes on when thermostat is set to ďonĒ but not when set to ďautoĒ when on heat setting ...seems to be the first year itís doing that.....not sure if this is possibly related but I did have to change the capacitor for the blower to run at all, which it does now...could it be control board (assuming this unit even has one)? Limit switch? Any advice super appreciated! Iím outta town so once I get back home Iíll be able to troubleshoot and even try a couple things it might be....
 
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Old 11-18-19, 12:42 AM
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Welcome to the forums.

Going to need a model number.
The blower can be controlled by a thermal switch or timer controlled from the board.
The board is in the section where the blower is. If you see dip switches on the board with blower shut off times listed..... the blower is timer controlled and the board is most likely bad.
 
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Old 11-18-19, 03:30 PM
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Thanks so much Pete for the quick response! Model no. MGH-065ABWN-07, and blower model no. is 9336C6901. Gonna see if I can upload a picture of the unit to see if that helps and when I get home I can take better ones.....so youíre saying itís either got a limit switch or control board but not both?
thanks again.....

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Last edited by PJmax; 11-18-19 at 04:17 PM. Reason: added enlarged view
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Old 11-18-19, 04:24 PM
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That's an OLD mobile home furnace. Standing pilot. Looks to be over 30+ years old.
Be sure to have the heat exchanger checked in that furnace for rust thru.

Inside that metal box will be a board with either three or four terminals.
That is the furnace blower control. Part #42 in the diagram link below.

M series gas furnace
 
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