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Goodman GMP100-3 home furnace status lite is constant red

Goodman GMP100-3 main burner will not ignite dont see any glowing or a spark hear a click but no flame and status lite is red

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  • Robert Nov 05, 2012

    Hello, is the inducer motor running? This is the motor above the burners

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  • Expert
  • 305 Answers

Check continuity of hot surface igniter....open loop means replace igniter

Posted on Jan 06, 2014

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: Goodman Furnace Lights But Won't Continue to Run

The flame sensor is dirty. You can not see the build up on the sensor but enough build up will change the resistance and the furnace thinks there is no flame.

To clean the sensor, first you need to locate it. it will be a sensor located in the path of one of the flames. Once you locate the sensor, open the bottom panel to turn"off" the furnce. After the panel is removed, unscrew the sensor from the frame above the jets. Use a clean rag and gently wipe the sensor several times. Place back in the cut out and close the lower panel.

The furnace should cycle on and the flame stay on for the normal cycle.

Posted on Jan 18, 2009

  • 56 Answers

SOURCE: Main Fan won't turn off even with thermostat removed. Burner not

There is a chart with the wiring diagram and othere charts that will tell you what the 6 blinks are for. That should tell you what is wrong and what part you need. Sounds to me like the board has an issue or the gas valve is locked out.

Posted on Feb 13, 2009

  • 288 Answers

SOURCE: Goodman furnace burner ignites then shuts off in about 10 seconds

if you have replaced the flame sensor and it will not stay lit, the draft safety switch may be opening. It works on positive and negative pressure created by the inducer fan motor.You may have a restriction in your heat exchanger or if is a high efficiency furnace, it may not have the drain tube installed properly with a trap. The trap works just like the trap under your sink and if water isnt in the trap, the pressures can be effected enough to open the draft switch(some call it an air pressure switch)

Posted on Jan 07, 2010

Therinnaiguy
  • 1420 Answers

SOURCE: 80% ducane furnace makes several attempts to

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!

Posted on Mar 04, 2010

SOURCE: Goodman down draft Gas furnace, red led flashes 6

Hello Try looking for a tiny TAN colored (button) near the front of the burner rack.It will have a wire in & out of it.In the middle there is a small tab/button.Push that in you will hear a click.That is the rollout switch.Check the vent/exaust pipe for blockage/draft to determine the cause of the switch tripping.The switch is a SAFTEY and repeated trips means there is a problem.

Posted on Sep 08, 2010

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Goodman gmp100-3 furnace The furnace will not start when I turn power on. It will hum but no click. The status light is solid red. Could the ignitor be bad? And what color should it be?


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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Goodman furnace gmh95090cxac wont stay lit keeps clicking will lite then clicks back off what would be the problem


Hello, if the burners light but do not stay on for more than 10 seconds, I would clean the flame sensor. The flame sensor is a metal rod that is on the opposite side of the Igniter, sometimes it gets coated by oxidation and does not sense the burner flame and shuts the Furnace down. To clean to kill power to tje furnace, remove flame sensor and clean with a steel wool, then reinstall and start Furnce back up. If this does not work then most likely the Igniter is too weak to ignite the gas and will have ro be replaced.

Oct 29, 2012 | Heating & Cooling

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My furnace wont come on its an automatic pilot so i dont know what the problem is we have enough propane


Hello, Most newer gas furnaces (propane or natural gas) has one of several different types of igniters. The most common one is called a hot surface igniter. This is a ceramic easy to break, glow coil, glowing igniter. Some has a Spark igniter that lights all the burners from a constant spark and some light the burners off a pilot proven /spark igniter. This one sparks then lights a pilot then the burners will come on. In any case if any of these types are not working they could be cracked or broke. Also the inducer draft motor has to be running, the little motor that hooks to the exhaust of the furnace ( if it has one ). This causes the pressure switch to close then the igniter should come on. My suggestion is to call a qualified service tech from your area to assist you. To determine which one of these may be your problem they will have to perform several test. Hope you get going soon. I hope this helped. J

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1 Answer

No flame


Several steps here to check...
turn power off unit and back on
set thermostat to heat
watch for pilot to ignite..igniter should glow orange or cherry red or spark if its a spark type ignitor
Did you see a pilot light ignite?

If not you probably have a bad igniter.

If pilot lit....in a little bit you hear a click of the gas valve opening..then the main burners will ignite

If you see the pilot and the main burner lights but goes out in a few minutes or immediately you may have an issue of the "high limit" switch tripping.

Is the blower fan turning that blows air out of your vents?
are all your vents open in your house? too many times i see homes with almost all vents shut.

Jan 08, 2011 | Goodman GMS90703BXA Heater

1 Answer

If the pressure switch fails to close is this because of a bad switch or inducer fan motor? goodman model gmp100-4


Do not assume that the pressure switch is bad nor the vent motor. The first thing to check is the vacuum hose from the pressure switch to the vent motor. Sometimes they get moisture in them and sometimes they get clogged in the start tube on the vent motor. Take a small needle or paper clip and clean out the start tube on the vent motor. Check the hose for dry rotting or leaks. Cut the ends back about an 1/2" if you have enough hose extra and then re-connect. Next step is to check your flue pipe for a restriction like a birds nest or a wasp nest in the outside termination point. Then to eliminate the vent motor from the equation, take the vacuum hose off the vent motor start tube and with the furnace calling for heat , **** on the hose to keep a constant vacuum on the pressure switch. Watch the ignitor glow or spark ingition start to spark. make sure it lights the burner runners and all burners are lite. usually the ignitor is on the first burner and then there is a flame sensor on the last burner. If the flame does not ignite to the last burner the flame senor will kick tell the control board to turn off the gas valve and shut down. If this happens pull the flame senor out with a 5/16" nut drive and clean lightly with sand paper and re-install it. Start the process over and you should have sucessfully fixed your furnace. If the constant vacuum does not bring on the ingnitor replace the pressure switch.

Nov 07, 2010 | Goodman GMS90703BXA Heater

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Main Fan won't turn off even with thermostat removed. Burner not


There is a chart with the wiring diagram and othere charts that will tell you what the 6 blinks are for. That should tell you what is wrong and what part you need. Sounds to me like the board has an issue or the gas valve is locked out.

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Main burners don't come on, though the ignitor goes bright


you should hear a click ,its the valve opening ? of check to see if the air fiter is clean ,

Jan 02, 2009 | Goodman GMS90703BXA Heater

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No ignition


Yes. Gas ignitors either spark or glow. Find a way to look at the ignitor, even if you have to use a mirror. If it sparks or glows, figure out why the gas isn't getting into contact with the ignitor. If it doesn't spark or glow, the ignitor is probably bad, but the controller might not be sending it electricity (bad controller). This is what electrical meters are for. Checking for voltage at the ignitor will tell you if the controller is telling it to ignite.

Jul 22, 2008 | Goodman Heating & Cooling

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