Question about Emerson Lennox Ducane Armstrong Furnace Blower Motor K55hxkpy-9740

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I have an Armstrong SX Ultra 90 propane gas furnace that the fan motor will not shut off ,the thermostat is on auto.

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Hit the side of the furnace. Some times there's a sensor inside that gets locked up from a dirty filter.

Posted on Oct 20, 2013

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Armstrong ultra 93


The blower motor may have to be replaced.

Jul 15, 2014 | Heating & Cooling

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Armstrong ultra advantage 93, propane. blower kicks on right away when i call for heat via thermostat. will not ignite. blower keeps running. fan set to auto. help!


Make sure that there is not a manual limit that has tripped and needs to be reset. Roll out limits, and check primary limit. On some models if a limit is tripped the blower starts to run right away.
I don't know if this will fix it. But that is where I would start if I was working on this problem. Then I would check if the combustion blower starts and then if it makes the pressure switch. Then check if the ignitor is sparking or glowing and getting power to it. A good volt meter will help in checking.
Good Luck.

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Heater heats but shuts off


Try the fan in the ON position on the thermostat, do you mean the fire shuts off or the blower?





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Jan 15, 2013 | Emerson Lennox Ducane Armstrong Furnace...

1 Answer

I have 1990 Armstrong gas furnace Ultra III 80, Model EG6G75dc8-4 .\r\nWhen I turn thermostat up , furnace comes on, burners come on, motor that I believe turns blower turns on but i AM NOT GETTING AIR...


have you checked your filter yet? the other thing to check is open the fan door and jumper the door switch,if there is one, and turn the furnace on. is the fan blowing air now?

Mar 22, 2011 | Heating & Cooling

1 Answer

Turn main furnace switch on, combustion air fan comes on and main circulation fan comes on. About 40 seconds later the igniter lites, two burners closest to the igniter fire up and immediatly snuff out....


Hello, if all the burners are not firing up then they must be cleaned out, usually dirt gets in the crossover parts of the burner and the gas cant flow to all the burners and therefore the flame sensor will turn off the furnace for safety. Clean the burners out this should fix the problem.

Feb 25, 2011 | Heating & Cooling

1 Answer

Gas Armstrong Ultra V Tech 91-Is green light supposed to flash?


Installed a new filter and furnace is running great now. The old filter was not that old, but we have been doing some remodeling and I figure that is what clogged it so fast.

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1 Answer

Armstrong ultra sx 80 furnace starts up and runs and then the gas shuts off for a few seconds and then lights backup and causes a small backfire my Ultra sx 80 furnace will ignite then immediately turn...


You have a dirty flame sensor. Look at the very last burner and you will see a wire going to a ceramic sensor and it looks like a thick wire. Take some steel wool or fine sandpaper and clean the surface off and it will work like a champ.

Let me know how it goes ken

Apr 15, 2009 | Heating & Cooling

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