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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Hi, if you have replaced the control board and pressure switch, you need to check the sequence of operation. Starting with the inducer motor, must start up to pressurize unit box and be sure the pressure switch is closed. Even though you have replaced this switch, it may not have enough pressure to close it due to condensation in hose, a leak and so on. Jump across this switch to see if the pilot will light next. If this unit has a flame roll out switch located by the corner burner, make sure it is not tripped. Sequence of operation is, first your inducer motor will start and vent old gases and build pressure. Pressure switch will make and send signal to ignitor board to start pilot. If you have a HSI pilot, (Hot surface ignition ) it will glow. Next it gets the flame sensor hot enough to send a signal that the pilot is proved back to the board to fire the main gas smart valve with 24 volts. Go through this check as I have layed out. The flame sensor is right along side of the pilot tube and if the metal tip gets dirty, it will not fire. You can clean it with sanding cloth or fine steel wool to clean. If you go through all of these steps and it will not fire after you have made sure you have 24 volts ac at all controls in the sequence I have said, check the main gas valve across terminal C and MV for 24volts. If you have 24volts and it won't open the valve, it is faulty. Check this out for me and let me know. If no 24 volts, you have missed a safety in the sequence.
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1 Answer

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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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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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Hello I have a goodman gas furnace


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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 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.

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