Question about Goodman GMS90703BXA Heater

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Goodman code 3

Here it is a goodman model gds80703ana ser. 0502211368. it says it has a code 3 (pressure switch stuck open) and here is what ive done with no luck at all. first i looked at the hose to the switch and noticed that it was split at the end so i cut off the little bit and put it back on didnt fix it secound i have toke my dvom and with the unit off the switch is open with it on the switch is a closed circuit. there is no water or anyother type of debres that could get in the way any any point i have checked them all! now early this week i had to replace the igniter cause it was broke in half. i replaced it and worked great now it broke agian. also the inducer moter kickes on and runs just like it always has. so any other suggestions would be great

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  • cs10v8 Nov 14, 2008

    well ive have fixed it! YA well after looking through the forums about the same problem and none of those solutions had worked i started to shake the wires to and from the board to the switch witch wile shaking them the unit started to kick on and off well to make this short the plug on the board the low voltage side had a bad connection so there it is i wiggled it and it workes



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If you touch your hot surface ignitor, the oil on your hands will shorten the life of the ignitor. If you not making connections, try lightly pulling terminals out further and clean contacts with a eraser

Posted on Nov 30, 2008


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I have a 1997 goodman 3.5 ton outside gas, self igniting heater. the led beep is 1 then a 2 then a half second delay.

I am sure you have gotten this fixed by now. A 1 code is a general lockout meaning it tried to light 3 times and did not. A 2 code is for a stuck closed pressure switch. That pressure switch is normally open. If unit is off, and you remove the wires and using a multimeter, ohm across it, it should be open. If not, it needs to be replaced.

Dec 18, 2009 | Goodman GMS90703BXA Heater

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Turn the heat up and observe the flash code....there's a legend in the furnace,or in the blower compartment that tells you what the flash sequence means...or in the Manual...........The flash code is likely for the Pressure switch...this part can either be defective or your Vent or Air intake could be blocked with Leaves,rodents,kids rocks etc...check the vent outside and look for obstructions and see that the air coming out the exhaust seems to be normal...........find the pressure switch which is round and has usually a grey small hose coming from the pressure switch and going to the furnace body or the exhaust fan....pull the hose off the opposite end (not the pressure switch...with the power off)...and slightly **** and blow repeatedly...(Really) and you will here the switch this several times at least...make sure you're activating the switch by hearing the clicking.....Turn the furnace back on and see if it works...if it does you need a new Pressure switch...if it doesn't your vent could still be blocked or the switch could still be defective02f491c.jpg

Nov 13, 2009 | Goodman GDS80703ANA Open Flame Mid-Size...

1 Answer

Code 3 - pressure switch stuck open. What do I do

where vent motor is there is usually a hose coming off which oressurizes when vent motor comes on, take hose loose **** or blow in it, take tooth pick and stick in all ports where hose connects (could be clogged) when sucking on hose you shoul hear pressure switch click each time you pull a vacumme, if fan has switch on back of fan as some Goodmans have the vent motor may need to be replaced.

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I have a goodman gcs90703bxa flashes 3 times blowed in the pressure hoses went from 3-2 flashes what could be wrong?>

flash 3 is a blocked pressure hose. the switch is open. flash 2 is the pressure switch stucked closed. if you applied pressure to the swich you may have damaged it . It typically clogs on the Induced draft motor housing on the bard fitting that the hose from the pressure switch connects to. sometimes if you take a paper clip and **** it out. but never apply pressure or tools to the switch.

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Pressure switch

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Goodman GDS80703ANA

Yes, goodman offers a kit. However you will need a gas technician adjust the pressure for you. The whole conversion will take about an hour. The kit may cost $50 and labor is anyone's guess. Call your gas company and give then the model and serial nimber. They can order it and install it.

Nov 19, 2007 | Goodman GDS80703ANA Open Flame Mid-Size...

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