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My son has a ducane gas furnace that will not come on .. it starts the blower motor then the glow plug lights for about 20 seconds then goes out ... it then repeats sequence .. I don't know model number yet ....

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  • shibobo2 Oct 06, 2009

    If the flame sensor is activated by the glow plug then I will try to locate the part locally. (I'm not familiar with the sequence on how the furnace starts up) I will be going to the site today or tomorrow for more info. Thanks

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Replace your flame sensor

Posted on Oct 06, 2009

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1 Answer

My ducane furnance blower wont ignite the thermost t keep going off


The blower requires proper voltage, I will include a diagram however if not familiar with power I advise against trying any repairs.

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Mar 04, 2014 | Emerson Lennox Ducane Armstrong Furnace...

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I have a Ducane MPGA100B4B gas furnace. The furnace only runs for about a minute then shut off. It does this far too frequent.\r\n First the induce draft blower turned on for a few seconds to check for...


Hello, sounds like the limit switch is opening on the furnace.Usually when a furnace goes off on its high limit is becuase the airflow is being restricted making the furnace overheat. a limit switch is there to protect the furnaace from overheating, most cuases are either dirt or the blower motor not running up to speed, anything that cuts down on the airflow will cause the high limt switch to open.

Feb 24, 2011 | Heating & Cooling

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We bought a duplex and it has a Payne furnace from 2007. No paperwork. The lower unit suddenly shut off. The furnace has a blinking red light and now has no heat blowing to it. Is there anything we can...


yes you can unplug furnace for about 20 seconds and replug then start up unit... a common problem with alot of furnaces this time of year is the hot surface ignitor fails which is the glow plug on the unit .. the unit when called for heat should start a small motor with a wheel on it known as the enducer draft motor then activates the round switch with the plastic hose connected to it...make sure the hose is not kinked or obstructed...pull the end off opposite of the round switch if you **** on the hose should here a clicking sound.. reconnect after the switch has closed then the power is sent over to a ignitor on most furnaces some have spark ignition but either way that is the next step after the ignitor glows red hot then the gas valve should open and fire off ..after it lites there is a flame sensor a metal rod that is in the direct path of the flame that measures current and keeps gas valve open once unit reaches temperature a limit will activate the blower to come on....where does it fail ... most units with a led code will have a sticker attached to the door outer or inner door with code meaning... count the flashes and then look for code...hope this helps out

Jan 25, 2011 | Heating & Cooling

1 Answer

I have a Rheem Furance that has turned off. Just a few hours ago the main fan turned off. The Furnace doesnm't light even the draft fan does turn on and then the main fan blower motor turns on. I can hear...


You will need to reset the furnace by turning the power off to it. Then as the furnace tries to light, watch the LED for blinking. Hopefully it will give a code other than 1. Try checking the air filter for blockage, make sure all hoses are free of moisture and any drains are not blocked. Check the air intake and exhaust pipe for sags where water could block it.

The sequence of operation is this:
Thermostat calls for heat, the LED may blink telling you it registers the call. The inducer (exhaust) blower starts closing contacts in the pressure switch (small disc shaped thing), the igniter glows orange (seen thru a small window high up on furnace front), gas valve opens allowing main burner to light, flame travels to all other burners, flame rod senses flame within a few seconds and keeps gas on. Room air blower starts within 90 seconds.

Any deviation or delay in this sequence and it goes into lock-out.

Jan 22, 2011 | Heating & Cooling

1 Answer

I have an amana furnace and it will not kick on. When the switch is turned on the furnace will try to run but won't warm up and blow. Does it have a pilot light?? or a reset button??


Try this----turn furnace off at stat and unplug furnace for 10 minutes. Plug it back in, the combustion and blower motor may both kick on for 2 minutes or so or not. Turn t-stat to heat and turn up stat to highest setting. Hurry out to furnace and you should hear the combustion motor(little motor piped to flue) kick on, then wait for a "click" next you should see a glow from the igniton element, then another click, next will be the gas valve opening. If no ignition, it will try 3 times and then lock ur *** out, and just turn on the blower just as a precaution. If you dont see the glow plug glowing after the first click, replace the $20 glow plug and you should be good to go. The glow plugs crack, and this is what breaks the connection. If you gas valve has a knob, and says pilot----turn the valve to pilot, push down on the knob, light the pilot and hold down knob for 2 minutes to heat up flame sensor. Make sure the t-stat is all the way down or off. After 2 minutes of holding pilot knob down, let go and your pilot should be still lit, if it is, then turn gas valve to ON and then turn t-stat up to kick on furnace. If ur pilot doesn't stay lit, get a new thermal couple and replace it-$12 bucks. Good luck and let me know how it went. azeddysac@yahoo.com

Nov 06, 2010 | Heating & Cooling

1 Answer

80% ducane furnace makes several attempts to ignite then shuts down. glow stick lights but no ignition to main burners. any ideas?


On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Check for 24 volts across the gas valve terminals!

Mar 04, 2010 | Heating & Cooling

1 Answer

Armstrong v tech 91 furnace. will not make heat. when on unit runs continuosly no matter what thermistat is set at. could mother board be bad,replaced once already. cah this be done by the home owner to...


These furnaces goes thru 4--steps for complete run time.... step-1, the small draft inducer blower motor blows and prove thru the small air tube that sucks a switch close to tell the circuit board to go to step-2......the glow plug glows for 15 seconds and step 3 the gas valve opens and dump gas in the venturi tubes and lights off the glow plug and proves thru a flame sensor (pin with 1 electrical wire connection) on the last venturi tube which tells the circuit board to go to the last step 4--, to turn on the main blower fan after 90 seconds!. Where ever it stops at then thats where your problem is!

Sep 12, 2008 | Heating & Cooling

1 Answer

I have an amana air command 90 furnace. the burner won't light.


This unit goes in steps, 1-- thru--4 Step 1, vent fan blower motor runs & prove thru the air tube, which closes a switch and tells the circuit board to go to step---2 Step 2 lights the glow plug and goes to step 3 automatically, Step 3, opens the gas valve and send in gas thru the long venturi tubes which lights from the glow plug and on the last tube, theres a rod that sticks into the flame, if no flame or not working properly, it will shut down the starting sequences and retry for 4-times and automaticaly lockout till unplug and start over. (whever step it stops at, then thats where your problem is!

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