Question about Goodman GMS90703BXA Heater

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I have a goodman gmpn 100-4 furnace. It will not heat! The furnace cycles on , flame ignites, runs about 5 seconds then quits. Then the cycle starts over. I've cleaned all the pressure drain lines. Also checked all of the electrical connections.

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Clean the flame sensor with a scotch brite pad....gently and replace it.

Posted on Oct 03, 2010

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I have a goodman gmpn that the middle burner has a little bit of flame rollout it kicks the flame sensor switch after about 1-2 minutes then it will not cycle back on. The flames are perfect until the main...


Unfortunately that means there's a hole in the heat exchanger, particularly in that cell of it. When the main blower comes on the air is pushed into the heat exchanger, causing the flame rollout. A heat exchanger crack or blowout is usually what condemns a furnace for good. Goodmans however, have a lifetime warranty on their heat exchangers, so you'll probably be able to find someone to replace it pretty cheap, or do it yourself for free.

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Thermostat calls for heat, purge motor turns on, 15 seconds later hot igniter turns on, then gas turns on and burners are lit. Problem is, they only stay lit for 5 seconds then shut off and cycle repeats...


,Hello, Make sure the flame sensor is clean near the burners, The flame sensor is a metal rod that is on the opposite side of the ignitor. To clean the flame sensor you will need some steel wool, turn off power to the furnace and remove the flame sensor and clean it with the steel wool. After cleaning reinstall it and turn power back on to furnace.

Mar 02, 2011 | Goodman Heating & Cooling

1 Answer

Heater unit will not ignite, will note fire up


Check your furnace by the electrical panel, there should be a blinking error light. Sometimes there is a legend to how many blinking lights means what. I had an issue with mine, read the code and it turns out it was hitting the high heat limit. Turns out my blower motor wasn't turning on. Replaced it with a spare and it was fixed. Find out what type of furnace, and google the name, model, and the words, 3 blinking lights. Does your furnace turn on at all? Does it start to go through the cycle then stop? This is the proper cycle of a furnace and what should happen.

Inducer motor kicks on, it runs for a little bit, about 3-5 seconds, then you should see a bright yellow glow, this is the igniter, shortly after, you should hear a click and the gas should start to flow, almost immediately it turns to a blue flame. Then your igniter should turn off and the blower motor start up.

Mar 02, 2011 | Goodman GMS90703BXA Heater

1 Answer

Goodman Model C16-28 1FF is not able to heat my basement. The burners igniting but only fire for approximately 5 seconds. This cycle continues about every 60 seconds. At times the burners only stay on for...


Sounds as though your issue lies within the flame sensor.

The flame sensor senses that there is flame present once there is a call for heat. It sends its signal back the board or ICM and the furnace operates as normal. If no signal is sent, then the furnace automatically shuts down as a safety procedure. The furnace will attempt to light several times before shutting down on a fault code or lockout.


The number 1 reason for flame sensors to fail is they are dirty. Check the sensor for dirt build-up. Clean the sensor with a damp rag or a scratch pad. Inspect the grommets for crackings. Also check and clean all grounds. If this doesn't work, you will need to replace the sensor or call for a service technician to ensure the sensor is the only issue at hand.

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1 Answer

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The board is bad. The unit thinks a flame is present, so it tells the blower to come on. Replace the board.

Oct 07, 2009 | Goodman Heating & Cooling

1 Answer

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If the igniter lights the burners the ignitor..... is not bad. Its like a light bulb.... it works or ot doesn't.
You are describing a dirty flame sensor. Dishonest contractors will sell you a new ignitor but clean the flame sensor when the are installing the ignitor. It is located at the opposite end of the burners than the ignitor. It has one wire going to it. Remove it and clean the rod with a piece of fine grit sandpaper. this should be done every year before heating season.
Good luck

Mar 28, 2009 | Goodman GMS90703BXA Heater

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sound like you have a bad fan motor

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You have a flame sensor that may just need cleaning take out and take fine sand paper or emery cloth and clean

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There is a vacuum sensor on most units tied from the exhaust gas fan to the sensor. Does the unit try to start? If the unit's exhaust fails to pull the switch it will turn off after about 30-45 sec after starting. "IT" thinks it's not exhausting and stops to keep from overheating. Do you have this exhaust fan and rubber hose to sensor? Can you see if that fan is turning on start?

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3 Answers

No heat, trouble shooting light has continious flash.


Try replacing the filter. Low air flow will allow the furnace to overheat. Sounds like a simple answer. Wish I had tried it before buying a flame sensor and controller. Live and learn I guess.

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