Question about Goodman GMS90703BXA Heater

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Blower works but no heat

I have a goodman everthing works, its only 3 years old but when I turn the heat on the pilots will not light. I read the instructions on the panel, did as it said and the pilot still will not light.

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If in fact you have the above listed furnace, you do not have a pilot but electronic ignition. You will need to remove the front cover on the furnace, tape down the door safety switch and then have someone help you by turning up your thermostat to a very high setting. Watch and listen inside the furnace. There should be some blinking going on at the control board followed by a small blower fan starting up. Then after 10-15 seconds there should be a click followed by an orange glow viewed thru the viewing window to the burner section. In a few seconds the gas valve should click and the burners will ignite. There is a safety switch that will sense flame and then keep the gas going to the burners. If it does not sense it, it will shut it off within 10 seconds. If all is well so far, your blower will turn on in about 90 seconds after flame. There is a diagnostic code chart on the back side of the access door if you get an error code (blinking) on the control board.

Always check little things like air filter, condensate drain and broken or loose wires.

Posted on Nov 11, 2008

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Igniter glows then gas valve clicks burners light then gos out after a couple trys then blower kicks on but blows cold air- i tried changed filters replaced thermostat -igniter vacummed inside. sometime heat works then change too cold air

Posted on Jan 30, 2010

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Goodman gmt070-4a wont heat, like the pilot light is out or something


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I have a Goodman forced air heating system in my attic that's only about 3 years old and I believe the pilot light went out last night in a storm. My problem is that I can't locate the pilot in the unit...


Marc, look for where the gas line enters the furnace and remove the panel adjacent to it. That should gibe you access to the pilot light. Also, look for a pilot access door, near where the gas line enters the furnace. The gas line will either be 1/2" flexible copper tubing. 1/2" black iron pine or 1/2" vinyl coated flexible stainless steel. Look for the lighting instructions inside or on the side of the unit.

Hope this helps you solve the problem.

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Ihave a Goodman GUS075-3 model. Turned the heat on for the first time this year. After abt 5 mins. running it started to smell like it was on fire, the breaker shut off. Now,the pilot keeps going out and...


I would suspect that your fan motor burned out. What I would suggest is wait about 1/2 hour with thermostat turned down to lowest setting where it is not trying to turn furnace on. I would then turn thermostat back up to call for heat and see what happens. Most electric motors have a thermal overload on them and if its on motor will not run until it cools back down. Even if this works I would recommend that you have motor replaced and clean blower. Hope this helps. Thanks

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GMT070-3A model was working just fine last winter. This winter it will not turn on. There are 3 blinking lights. Only yhing that changed was we had new roof and I got roofer to come check to make sure...


Hello. I can assist you. Let's begin with the pilot light. The most common reason a furnace pilot light keeps going out is the thermocouple is placed too far from the pilot light. The thermocouple is a sensor inside a steel sleeve that sits in front of the pilot light. The pilot light must heat the thermocouple so the thermocouple can keep sending an electrical charge back to the furnace, which keeps the gas valve from shutting closed. To that end, the pilot light should be adjusted so the flame it gives off is at least two inches long. Should it still keep going out, the thermocouple is faulty and needs to be replaced.

This alone may be all you need. However if after you get the pilot lit you still have the blinking lights, read on. you also may have an internal overload on the motor that opened .you can also check the motor itself by first shutting off power to the unit and physically cut the 2 power leads wire feeding the motor and OHM out the motor if you get no reading the motor is opened internally and bad ,you can check the motor to ground to check for a short.take one meter lead and attach to a good ground on the motor and the other check one motor lead at a time if you get a reading your motor is bad .you should not get any readings ( look at the wiring diagram ventor motor it should show a capacitor ,if it has one.)Capacitors are usually mounted next to or near the motors. not far away.Sometimes they have them strapped right on the motor inside a metal box.If you don't see a lump at the motor itself doubt it has a cap. also the wiring diagram will clearly show if it does. I'm sure if you look at the wiring diagram for the indoor blower motor it will show it.

If indeed you have one ( cap. ) the only way I know how to check it would be with a NON digital ohm meter the old style ones that have the needle deflections ( unless you have a capacitor tester ) remove capacitor and short out the two terminals to each other. then clip one end on one terminal other touch the other side. (OHMS scale) if you get a needle deflection then it drops back to the left side the cap. is good. (you may have to adjust the ohms scale to get a middle of the meter reading.If the needles pegs in the opposite direction you need to reverse the two meter connections. everytime you want to check the cap. you need to short the cap. terminal together I use a screwdriver holding the insulated handle and having the metal shaft of the screwdriver touch the cap. terminals.
if you get no meter movement the cap. is bad. if you get a needle movement but it goes to the opposite side and never returns then its shorted and no good . all you want is to have the needle move up then drops out and goes back. that tells you that the cap. is discharging from one side to the other to help start the motor.

Your unit is Manufactured by GOODMAN and as far as I know they have one of the better warranties out there.If you determine it is the motor Goodman bumped the warranties from 5 years parts to 10 years parts in 2006 or 2007 .

Also where is the operating instructions for this unit? last Goodman 90+ condensing furnace we installed had all the codes ( blinking lights and TROUBLSHOOTING GUIDE ) inside the install guide. So I would say to you is whoever installed your unit get the install guide from that company, person. Good luck with it.

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1 Answer

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Heating not working


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1-Ignitor failure
2-vent blockage
3-tripped rollout safety switch
4- tripped limit control
Etc...
Look at the door of the unit for a explaination of the number of flashes of the light. This may get you started in the right direction.

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