Question about Goodman GMS90703BXA Heater

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I have a Goodman GUPI100-5 pilot comes on but wont fire up.

I replaced gas valve ,I have 24 volts to gas valve,I have 3 volts from flame sensor. is it the igniton module or sensor? HELP!!

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  • pkg1966 Nov 25, 2008

    I put 24 volts to gas MV and it opens up then it fires up the buners.Im going to replace ignition module see what happens.

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Your flame sensor is measured in Millivolts not voltage. Is the flame spreading accross the burners at all? If it only ignites on one of the burners, you have debris blocking the flame spreader. Clean the burners and flame spreader bar. If you just as you say get a pilot, clean the flame rod.

Posted on Nov 25, 2008

  • Chandler Ede
    Chandler Ede Nov 25, 2008

    Good Job gum shoe!

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Being as how you changed the gas valve, make sure the arrow on the bottom of the gas valve is pointed towards the burner. Check for 24 volts at the common and main valve terminals on the gas valve when the thermostat is calling for heat...terminals MV and C. You will only have 24v there if the flame sensor senses flame... either pilot flame or main gas. You coud have 24v there without gas flowing or flame if is is a thermocouple standing pilot system and the gas valve is not in the 'on' position. But standing pilot systems usually do not have flame sensors.

With a flame sensor in the system, you have to have either spark ignition or glow coil ignition. If its spark ignition check for 24 volts at the pilot valve and common terminals on the gas valve WHILE the ignitor is sparking. That would be PV and C. The ignitor should spark and 24v should be on PV and C for 30 seconds to a full minute without ignition if it is a spark-to-pilot system.

If you have a glow coil, it will energize and burn bright orange for a minimum of 30 seconds BEFORE the main valve is energized. Then MV and C is only receiving 24v for approximately 5 to 6 seconds. This gives the flame sensor the time to prove the flame....if it does not prove flame, the system shuts down.

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In what you have said you have 24 volts to the gas valve and it has not lite. then does the gas valve have a pilot tube???Does it have a thermocouple?? Do you smell gas?? If you don't smell gas then the main part of the valve has not opened. The Pilot valve has to open first and prove before the main gas will come on. I hope this helps. If you still need help repost with the name and model # of the furnace.

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Hi, It says this problem is still not solved, but its been 4 months ago? Anyway, when this happens, the inducer motor will start on a call for heat, close the pressure switch and then the glow plug will turn orange or a ignitor module will turn on for a few seconds and then the gas valve should be energized by the control module to open and start the heater. So, on your heater you will have what is called a flame sensor that lays along side of pilot tubing and is porcelin with a metal tip and a wire coming out the back that plugs into the module. It senses heat by pilot flame or direct heat and will send a signal back to module to open main gas valve. If you have no pilot at all, you need to check to see if you have gas to the unit first. Get a good sized adjustable wrench and loosen the gas flex coming to the valve to see if you smell and hear natural gas. Bleed it off to get any air it may have. Tighten back down and make sure you have no leaks. You need to get a cheap digital meter. They are very inexpensive. Go to Sears tools and get one for around $19.99 a craftsman.Set the dial to ac voltage the lowest setting above 24 volts what ever the scale reads, such as 200 vac.Now start you furnace, but be for you do take the red and black leads of the meter and put the red lead on one of the connections that reads MV and other to C. Now start the heater and let it go through the sequence of operation. When the ignitor starts to click to light the pilot, the meter should read 24 volts at the valve. If the vale has more then 2- wires, see if it is marked PV and put your red lead to this the pilot valve. As it is clicking there should be 24 volts ac there to open pilot valve. If not, the control module is faulty, only if there is 24 volts to it and you had gas at the flex line. If you have no voltage to this gas valve when the control module or board is clicking, this module will be faulty as it is not putting out 24 volts to the gas valve if you have gas to it. This is a simple check. If you can see a pilot light back there and the gas valve will not open, you will need to check this flame sensor. Carefully remove it. Take a light piece of sanding cloth and clean up the metal tip on it. Now install it and make sure the tip is in the pilot flame. Start it back up and it should fire the MGV to open right away. This should have taken care of your problem. let me know the out come.
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1 Answer

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Check for 24 volts across the gas valve when Ignitor is glowing. If no, bad board. If yes, bad gas valve or blockage.
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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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.

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One blink means it didn't light after a number of attempts. You replaced the circuit board and gas valve. Read on for some suggestions. 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.

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1 Answer

Hello I have a goodman gas furnace


On a call for heat, the 24 volt thermostat2.gif 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 ignitor. The ignitor will glow and you will be able to see it if viewed thru the small inspection port. Once the ignitor 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 ignitor does not energize (bad control, bad ignitor), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not lite (dirty pilot), the burner does not lite (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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Most newer furnaces will have a diagnostic center or control built into the control module. You may be able to view it as it is running thru a small viewing port. Some models will require the removal of an access panel prior to finding it. On the reverse of the access panel, there will be a diagnostic chart that will aide you in understanding any error code recorded (usually a blinking light).

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