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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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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We have a Goodman gas pack (PGB 030075-1)and no heat. A/C works fine. We can get the blower to come on but nothing but cold air comes out. Do we have a pilot light on this unit that needs to be lit?


Amy,
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If you have a gas supply and it is turned on you have electrical problems inside the unit.

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My heater blows cold air. any ideas?


Your unit has a diagnostic light on the circuit board. You need to look thru a small viewing port to see it. Once you count the number of b links, remove the lower panel and look at the wiring diagram for an error code chart. Then read the following to give you some ideas what to do.

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

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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