Question about Goodman GDS80904BNA Open Flame Heater

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Goodman gmp050-03 heater

Turns on, fires up blower fan kicks on...two minutes later gas turns off but unit keeps running, red light indicates stuck gas valve...now what

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Either yourself or a Heating specialist will have to replace the gas valve.. Once installed you will plug unit back in which will reset power board and should work fine

Posted on Feb 13, 2009

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My Bryant Gas furnace model number is 373LAV036095 the pilot light won't light. Gives us indication that the pressure value is stuck??? Sends into lockout mode. Where is the pressure value located in the...


This is a down flow unit. There is no pressure valve on this unit. Here is all the parts on this unit.
1. Manual - reset, when used.
2. Blower and blower motor
3. Relief box also known as a exhaust flue.
4. Gas valve control knob or electric switch, ON/OFF
5. Gas Valve
6. Gas burner
7. Ratting plate
8. Blower door safety switch
9. Blocked vent safeguard tube and switch
10. Gas Manifold
11. Manual limit switch (2)
12.Hot surface ignitor
13. Flame sensor
14. Inducer blower motor
15. Control board with relays and transformer.
That is all the parts. The first thing the heater gets a call from the thermostat to the control board marked W. The board sends 24v to the inducer fan relay which makes and causes the inducer fan to come on now there is a small tube that runs from the inducer fan box to a switch when the switch makes it sends power to the board which proves you have cleared the exhaust flue then the flat surface ignitor starts to glow and then gas valve opens and fires. now if this tube is stopped up the heater will not fire and will lock the unit out. Also if the flue is stopped up with trash it will do the same thing. If you are not familiar with gas heating units you should call a service company out and check out the system there is a lot of things that need to be checked out every heating season as to keep you and your family safe.

Mar 02, 2015 | Heaters

1 Answer

Blower fan not working


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2 Answers

My goodman furnacs says my limit switch is bad blower works but does not ignite .....? its modle gmt070-3 and where is it located


There are several limit switches in the unit there in various places in burner compartment. One on blower housing . One thing that I would try is replaceing your filter and turn the power off to the furnace and try starting the system after power is D/C for 5 minutes.

May 02, 2011 | Goodman GMS90703BXA Heater

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I have a goodman gpmn furnace. The ignitor lights, and then the flames turn on, then the blower kicks on, and about 30 seconds later the flames turn off, and the blower continues to blow air. We have tried...


Hello, looks like you limit switch keeps opening because your furnace is overheating, Check your air filter and blower wheel to make sure it is not dirty and make sure you blower motor is moving at the proper speeed. Usually when air flow is cutoff the limit switch will open.

Feb 15, 2011 | Goodman GMS90703BXA Heater

1 Answer

We have a goodman split unit, It was below freezing the other morning and the unit had a squeaking sound when it started up. Now it has warmed back up, the unit is sounding as if it's trying to kick off...


The symptoms seem to be related to the main blower motor and/or it's capacitor. Turn the system off for a couple of minutes and then turn just the fan on while the thermostats heat setting is in the off position. If the lights still dim then replace the motor and capacitor. The clicking noise is the fan relay.

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Feb 12, 2009 | Goodman GMS90703BXA Heater

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I have a Goodman furnace GMPN080-4 REV B. I had the blower motor take a dive, so I replaced it with another equivalent 115 VAC 60 Hz 1/2 HP motor. I replaced the 10.0 MFD +10% -5% capacitor with a 7.5 MFD...


limit switch is on the heat exchanger black plastic about 1and1/2 in. by 2 in. with 2 wires going to it , it has 2 screws holding it in take it out and check it with an ohm meter and you should not have a reading if it is good

Feb 01, 2009 | Goodman GMS90703BXA Heater

1 Answer

Goodman Furnace m/n GKS90453BKAC


A constant red light (not blinking) indicates that the thermostat is not calling for heat. Of course you know it is but just to be safe, jump out R and W on the board. If it continues to do the same as you indicated, replace the board.

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1 Answer

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You might have a sensor issue where it thinks it's too hot and kicks on the gas exhaust fan.

Oct 01, 2007 | Goodman GMS90703BXA Heater

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