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Chauncey Daugherty Posted on Dec 11, 2013
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I have a Coleman AGU10016A Gas Furnace which initially runs fine but after a certain time shuts off and cuts gas to burners and pilot what is the problem?

Coleman AGU10016A Gas Furnace

1 Answer

Brian Mills

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  • Master 613 Answers
  • Posted on Dec 17, 2013
Brian Mills
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That's a safety to prevent an unsafe condition. It is caused by any number of protective devices such as flame roll out, blocked flue pipe, fan stopped working and causes the heat exchanger to get too hot and trip the limit switch etc. Call a qualified tech to deal with gas appliances. Gas isn't a DIY thing.

5 Related Answers

mrgrzz

Dale Koehn

  • 88 Answers
  • Posted on Jan 20, 2009

SOURCE: furnace blower not working how it should

first off buy yourself a honeywell stat, in my personal opinion lux stats are garbage, I have run into so many that are bad stats !!! but as far as your fan not shuting down, sounds to me like your fan center on your circuit board is bad and will not shut down the fan when needed, you will have to replace the circuit board, as the fan center is a part of the whole of the circuit board, hope that helps

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blender719

  • 53 Answers
  • Posted on Oct 08, 2009

SOURCE: My coleman floor furnace will not stay on

Have the thermocouple replaced, ensure the pilot flame is blue - not yellow, yellow indicates blockage in pilot

Anonymous

  • 43501 Answers
  • Posted on Nov 12, 2009

SOURCE: Coleman Gravity Floor Furnace need millivolt gas valve & pilot ki

Go to www.grainger.com and look for a "power pile generator" this is a millivolt thermocouple that may be just what you need to make your heater work again

Anonymous

  • 5 Answers
  • Posted on Dec 04, 2009

SOURCE: I have a GE (Rheem) SmartWater SmartShield Sensor gas cut off

The click you hear is the gas valve shutting off flow. It does that because the thermocouple (a rod sticking into the flame of the pilot) voltage drops, usually below 13 millivolts or so. Might be a loose connection from thermo to valve body (should be finger tight plus 1/4 turn) or a bad thermo ($13 at Lowe's). Good Luck.

cjfmc

  • 39 Answers
  • Posted on Apr 04, 2010

SOURCE: I have a Rheem Criterion II Gas Furnace that has

Turn off the power to furnace.
on the last burner to light there is a small metal rod in front of the burner. This is a safety called the flame sensor. It is dirty. Unscrew it from the bar ( 1 Screw) unplug the connector wire from it and clean it with steel wool. it will be kind of burnt. Plut back in place and turn on the furnace to cycle.

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Where is the flame sensor for my coleman dgaa090bdta furnace?

That’s a model number for a mobile home furnace. The flame sensor is inside the burner chamber. You have to turn the gas off, remove the screws that hold the two plates around the gas valve, and pull the whole burner assembly out. Be careful of the igniter, and don’t use sand paper on the flame sensor ??
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Furnace reaches temperature set then shuts down and restarts 8 times before final shutdown.

When you say the the furnace re-starts 8 times before shut down, what is cycling 8 times? just the indoor blower or is the main burner re-firing 8 times? If it's only the fan it sounds like the fan control.
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My Coleman furnace 4322/729 model lights the pilot but won't cut in . What could be problem ? Cleared lines Complete

Gas valve not opening? Does it have the exhaust blower that pulls vacuum switch allowing burner to light?
(1) Thermostat not working? Has to complete the circuit in or gas valve to open.
(2)Can be a stuck or bad gas valve. Try tapping the side of the gas valve body while thermostat is calling for heat. Tapping,not pounding. Like lightly,yannow? don-ohio (:^)
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Pilot and burner light then gas shut off model 7900

How many degrees before it reaches desired temp, does it shut off? A thermostat is designed to shut the furnace off a couple/ few degrees before it reaches set temp. It has what is called a heat anticipater, which shuts the burner down, and lets the blower use the remaining heat from the heat exchanger to bring it up to desired temp making it more efficient. If it is more than a few degrees, replace the thermostat. You can jump out the red and white wires to confirm the faulty thermostat. If by doing this, the furnace never shuts down, until you separate the red and white wires. That confirms a faulty thermostat. Hope this helps someone.
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Coleman h 90 gas furnace will not start up when thermostat is turned up

The gas valve is not lifting hence no gas flow , check pressure switch if fitted jump out thermostat see if it lights ,
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Hi~ i have a coleman-evcon heater in a mobile. The heater comes on when the thermosat is turned up to, say 65 from 55, then before the air blown out is even really warm, it shuts off. it runs on propane,...

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).
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I have a EVCON furnace DGAT070BDC. I replace the igniter control, the gas valve and the thermostat. Same problem continues: glow stick works, then the pilot lights works.The igniter control clicks...

You may have a dirty/rusty burner that is clogged or your gas valve
manifold pressure setting may be too low. Normal manifold pressure
is 3.5 inches water column on natural gas furnaces. ( 1 psig is equivalent to 28 inches water column). Pull and clean burner. Also
check and clean pilot assy. including flame sensor (if present).
Please let me know.
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Furnace runs about 1 minute, then total shutdown

What type of gas supply line do you have? Is it black pipe or copper? If it is copper, there can be a film like substance that builds up on the inside of the copper. The debris will the get caught in a pre screen where the supply enters the valve thus cutting the supply of gas to the unit. Also, the thermocouple may be bad. You didn't say that you replaced it. Try replacing it as well. Also, you could have a limit switch turning the system off and thus cutting the gas off completely but it is highly unusual for the pilot to be cut off as well unless the pilot is being blown out when the gas is shut off. Also, turn the unit to fan only without calling for heat. Using a flame of some sort, put it into each baffle of the heat exchanger. If your flame is being blown around in one of the baffles, then you have a hole in the heat exchanger and what is happening is that the roll out switch is cutting the unit off and the air still moving through the heat exchanger is blowing the pilot out. I have seen this actually happen. If your furnace is in excess of 15 years old, it does need to be checked for possible holes. If it is in excess of 25 years old, it is a huge possibility that the unit has already developed a hole. If you feel hair coming out of one of the baffles, then shut the unit down immediately and have it replaced!
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On a standing pilot, coleman gas furnace, when burner fires, the flame burns wildly on high burn. Could this be because the air adjusment is set incorrectly? In a short time it blows out the burner, and...

HEY J, this could be a dangerous situation. You could have a crack or rusted out heat exchanger, if this unit is over 20 years old, which it is because it a standing pilot, units are obsolite! This could be letting in CO2 ( carbondioxides-- poision gas fumes) n, Oklahoma, our gas co. will come out for free to give our units a CO2 gas fume check anaylsis. Check this out before someone dies or ill repairable damage done to the body! Thank-you-very-much!
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Pilot goes out

If the pilot won't stay lit, the thermocouple may be loose or faulty, the pilot orifice may be clogged, or the pilot light's flame may be set too low and needs to be adjusted. You can clear a clogged orifice with a piece of thin wire, such as a bread tie with the paper stripped off of it. Be sure to turn off the gas to the furnace first! Also shut off the switch or circuit breaker that controls power to the furnace. Just poke the thin wire into the tiny orifice where the pilot flame normally burns to knock off any ash or debris. Some pilots have a flame adjustment screw for adjusting the flame. To adjust this, refer to your owner's manual. Normally, this is simply a matter of turning the flame adjustment screw to achieve a full, steady 1 1/2-inch to 2-inch flame that doesn't have any yellow in it.
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