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I have a GMP100 gas furnace. I need the diagnostics table that provides the meaning of the status light states. I get flame for 20 seconds and then the gas is shut off and LED on control board blinks 3 times. The flame sensor looks clean. I wired the flame sensor lead to ground as a quick test but then the gas goes out in 6-7 seconds. Any thoughts?

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  • fh_coach Jan 05, 2009

    Thanks but any help on the diagnsotics codes? The table is supposed to be on the back of the furnace access panel but it's missing.



    Seems like it's either a bad sensor or bad control board. Having the diagnsotics table would help me further troubleshoot and would be great to have for future reference.

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Hi!!! you just answer your question.change your flame sensor cleaning it wont work..


I have a GMP100 gas - a82a250.jpg

Posted on Jan 05, 2009

  • lorenzo banks
    lorenzo banks Jan 05, 2009

    change flame sensor..

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You should hear the ignitor pop. If you don't hear that pop sound, then the igniter is bad. They are easy to change, just make sure you turn the gas off and the pit-cock into the appliance and take a photo of exactly where the igniter tip is oriented so you can put the new one in the same spacing to have it ignite properly. The status light should be green when the furnace is 'On.'

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Any light flashin on the control board? If not then look for a small fuse blown on the board. See lights a flashing count them flashes

A sampling of various failure codes on a furnace:

Read one LED flash that stays on continuously to mean your furnace has no signal coming from the thermostat and will not operate. Turn the power off and check the thermostat for improper settings or connections.

Interpret one LED flash that blinks on and off to mean your furnace has locked out because it could not ignite after three tries, and must be reset. Interrupt power to your furnace for 20 seconds or lower the thermostat so your furnace does not try to heat, then reset the thermostat to the previous setting. After one hour of lockout, your furnace will automatically reset itself and try to operate as usual.

Decipher two LED flashes to mean the draft blower is not working, or your furnace has a short in the pressure switch circuit. Turn off the furnace power and repair a short or replace the pressure switch.


Read three LED flashes to mean your furnace has an open pressure switch circuit or it has an induced draft blower operating. Check the pressure switch hose of your furnace for blocks or an improper connection. Also, look for blockages in the flue, and tighten any loose wiring.

Translate four LED flashes to mean your furnace has a primary limit circuit open, possibly from loose wiring or blocked filters. Check and clean filters, tighten wiring and check the flue for blockages.

Interpret five LED flashes to mean your furnace senses a flame without a call for heat. This could be from a gas valve closing slowly or a burner flame lingering.



Read seven LED flashes as a warning of a low flame sense microamp signal. This could happen with a coated flame sensor or a lazy flame from poor gas pressure. Turn off the power and adjust the gas pressure according to the information on the rating plate.



See eight LED flashes as meaning an igniter circuit problem due to a bad igniter or an igniter connected improperly. Replace the bad igniter or check the ground wiring, making necessary corrections.



Decipher nine LED flashes to mean the high-stage pressure switch circuit will not close during a high-stage-induced draft blower operation. Your furnace may have a pinched or blocked pressure switch hose, a blocked flue or loose wiring.

Read continuous flashing on the LED to mean your furnace has a reversed polarity of 115 volts. Turn off the power and correct the wiring polarity after reviewing the wiring diagram.

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Will need to know model and seriel of furnace - sounds like a dirty or defective flame sensor. Flame sensor can usually be cleaned by simply wiping it with a slightly abrasive paper, or 0000 steel wool. Most electronic ignition types have a diagnostic code generally located on the ignition control, and depending on the number of "blinks" from the diagnostic light it will tell you why the unit did not fire.

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1 Answer

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Check the air filter.
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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1 Answer

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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).

Your furnace does have the diagnostic light! Look for it on the control board. There is a small viewing port that you can look into from the outside of the furnace. The wiring diagram will have the codes to help you.

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On the last gas venturi tube there should be a flame sensor located in the flame to prove it exsists, if its coroded the spark can,t jump back thru the moisture molecues in the gas to prove it has a flame to tell the circuit board to keep the gas comming. Just reomve the flame snsor and sand itand replace itback. T. Y. V. M.!

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