Question about Goodman GMS90703BXA Heater

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Goodman model gmt090-3a vent pressure switch code. what does this mean?

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The pressure switch tube is clogged. you can find by looking at the inducer motor which is the small motor towards the top of the furnace ,there will be a rubber hose coming off it going to a round disc with two wires attached to it. remove the hose from the disc and blow thru, if you cant remove the hose from the motor and insert a small paper clip into the barb fitting the hose was connected to until its clear and reconnect the hose . recycle power. you should be good to go.

Posted on Oct 04, 2009

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I am getting a code of 34

Posted on Oct 04, 2009

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Furnace problems


On - OK
1 Blink - Ignition failure. Check Gas flow, gas pressure, gas valve, flame sensor.
2 Blinks - Closed pressure switch. Check pressure switch (stuck in closed position).
3 Blinks - Pressure switch - failre to close. Check venter, pressure switch, vent blockage.
4 Blinks - Open limit switch. Main limit or aux limit are open. (My comment - Means overheating in chamber. Often result of blocked intake air. Bad filter. In my case, plastic wrap had been sucked into the intake. )
6 Blinks - False flame sensed. Check sticking gas valve.
Rapid continuous blinking - Incorrect twinning, incorrect primary polarity. Reverse transformer secondary leads, reverse primary wires.

Closed pressure switch can be from dirty combustion vents, bad chamber pressure - like missing screws, maladjusted gas pressure, failing pressure switch, loose hoses, moisture in the hoses or fan blades The switch need to be closed to ge the unit to work

Jan 23, 2008 | Goodman GMS90703BXA Heater

1 Answer

I have a goodman pack unit. mod. pgb036075-1-rev-a ser. 9703825493. Control board is showing a 3 flash which is a vent switch error but the two wires that come from the inducer motor go strait to the...


Make sure the plastic on the boards terminal connections are not disguising a weak connection. If those are good, use a manometer to check vent pressure at the inducer connection. If it falls below the measurements listed on the pressure switch then the problem is in the flu system or lack of combustion air. If the pressure does not drop below the listed measurements replace the pressure switch.

Dec 09, 2010 | Goodman GPC1342H21A Air Conditioner

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Light blinks 3 times on a Goodman model gmh80453an


Three blinks is an indication of a pressure switch error. Check your air filter, condensate pump or drain, vent termination and air intake for blockage or debris. Also check the inducer housing assembly for a build-up of water. Pull off the hose(s) going to the pressure switch and clear out any moisture. You may be able to jump out the pressure switch only after the inducer starts blowing to test it. If it starts, the switch is bad. If your venting runs horizontal for any length, make sure there is no build-up of water in either pipe by tapping it and listening for a thud. It should sound hollow and echo when you listen. If you **** in on the pressure switch very lightly, you should hear it make contact and you can test it with an Ohm meter for continuity. Hope this helps!

Jan 18, 2010 | Goodman Heating & Cooling

1 Answer

I am getting the pressure switch blockage and the three red light code. Replaced the pressure switch and still does not work


Hi, the pressure switch won't close error isn't always caused by a defective switch. Occasionally, there really is a blockage in the vent system and that is why there is a pressure switch. You should check for such a blockage, usually caused by a smashed vent cap or spider webs in the vent pipe. Good luck.

Jan 11, 2010 | Goodman Heating & Cooling

1 Answer

My Goodman High efficiency furnace stopped working and I getting 3 flashes from the red light in the viewing window. I know that this is a malfunction code but I can't find out what it means. Can you help?


On the panel with the wiring diagram, there is an error code chart. I think 3 flashes is a pressure switch problem. Check your air filter, condensate pump or hoses. Check the small hoses going to the pressure switch, check your air intake and exhaust vents. Remove any moisture or debris. Make sure all venting pitches back to the heating system and no low spots are holding water.

Dec 10, 2009 | Goodman Heating & Cooling

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MODEL # GMS80903BNA. MY FAN COMES ON BUT THE


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 clicking....do 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.

Oct 27, 2009 | Goodman GDS80703ANA Open Flame Mid-Size...

1 Answer

Goodman GMS90904CXA Wont ignite, light blinks 3 times


Ok, you either have a inducer fan issue or a pressure switch issue or a plugged vent pipe. The inducer turns on to establish a draft for the exhaust. If it is not working you will get this error code. If the pressure switch does not sense pressure caused by the inducer, it will give this code. If either the intake pipe or exhaust pipe is blocked (even y just a little) it will give you the same error code. If the condensate hose or receptical is plugged, again it will give you this error code. Good Luck!

Oct 20, 2008 | Goodman GMS90703BXA Heater

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