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I have a 1993 Goodman, GMP075-3 that won't turn on. I do not have a vent blockage so I think it is the pressure switch. What is a venter and where can I find it??

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Venter is the inducer motor.

Posted on Dec 31, 2008


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Problem with furnace not kicking on.

could be one of a few diff issues. firstly, the air pressure switch may be failing. check to ensure the inducer motor is providing enough air flow for the air switch to close. if inducer motor isn't creating enough air flow the faults is within the motor. If the airflow is enough, then fault maybe the air switch. you also need to check for any blockage in the exhaust. ensure no debris is blocking the vent going to outside

Jan 21, 2014 | Goodman Heating & Cooling

3 Answers

1993 goodman status light 4 times blinking

Witch blower is running, the inducer or the systems blower?
System blower could mean the the high limit is opening and shutting down the systems gas train, I would check this out first.

The other problem could be with the pressure switch for the gas train, it is supplied from the inducer motor, check to see if it is operating fully.

HSI boards do go from time to time, this sounds more like a system control problem.

Jan 24, 2008 | Goodman GMS90703BXA Heater

1 Answer

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

2 Answers

Problem: Pressure Switch Failure to close


The t-state set to fan "ON" will only cycle the fan to turn on only nothing else. "Auto" is where you always want the t-state on when you want to have heat and have the fan cycle off automatically after the t-stat has reached set point.

As for the press switch, there can be two things that will cause the pressure switch not to close. 1: obviously the switch itself and 2: the inducer fan, this has the rubber tubing that connects to the pressure switch.

When you call for heat, the inducer fan ( small fan with black plastic piece that spins ) is the first to turn on, this fan makes sure any left over exhaust air/gases are vented out before the burners turn on, it also stays on the entire heat cycle to exhaust the gases. The pressure switch needs proof of air so the pressure switch closes with the vacuum that is being created by the inducer fan in that rubber hose that is connected to the pressure switch. This allows the furnace to know " my induce fan is working, lets proceed".


I would make sure your inducer fan is working. if you don't see it working then I recommend using a multi-meter ( VAC setting) and checking that you have 120volts supplied to the inducer fan. if you don't, then you need to work backward from there and see why you don't. If you do verify 120volts at your inducer motor, then more than likely it failed and will need a new one. Witch out this, your pressure switch wont close.

If your inducer fan is working fine then make sure you have 24vdc across you pressure switch (again with a multi meter but with VDC setting not VAC). 24vdc in and 24vdc out. If you only have 24VDC in but not out, then you pressure switch may be stuck open. ( This is if your inducer fan is working properly).

I hope this helps. Sorry for the long response. I just don't like people changing parts and wasting money.

Sep 28, 2017 | Goodman GMS90703BXA Heater

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

Goodman furnace wont come on

If this is a High Eff furnace:
1) Remove the compartment that has the igniter and burners, turn the
power back on, if the furnace lites then you have a problem with the
intake air vent, probably iced over if you live where its cold.

2)Make sure the exhaust vent is not getting backpressure from the

3) you could cut the pipes on the inside of the house to disconnect them from the furnace, test run the furnace with no pipes.If the furnace
runs then you have a problem with the installation of the vent pipes.

4) Do not run the furnace without the exhaust pipe disconnected,
go to the hardware store and get a couple of rubber clamped
couplings and hook-up the exhaust pipe!

Good Luck

Jan 09, 2010 | Goodman GMS90703BXA Heater

1 Answer

Three blinks on gas furnace, will not maintain flame

3 blinks indicates a pressure switch error. Check or replace air filter, condensate hoses for blockage, check small hose uo to pressure switch(s), check the vent pipes to make sure they pitch back to the furnace, check the air intake and exhaust pipes for any blockage outside. If all looks good, jump out pressure switch as soon as the exhaust fan starts to turn and see if unit starts. If it does, replace pressure switch.

Dec 01, 2009 | Goodman Heating & Cooling

1 Answer

Goodman GMP075-3 Random Incomplete startup

If the draft motor starts then shuts right off and then a red light comes on usually means that there is a blockage somewhere. Check the pressure switch line, make sure that it is clear and the hole in the heater that the pressure switch vaccum line runs to is open. If that checks out then make sure that your flue vent cap is on and that it is not pressed down on the flue vent and that the gases can vent properly

Feb 13, 2009 | Goodman GMS90703BXA Heater

1 Answer

Goodman: My Power Venter (aka Heat and Draft Inducer) won't start

The power ventor most likely needs to be replaced. But be advised. Goodman normally will not sell parts to anyone but a certified technician. I had to show my masters certificate to buy parts from their outlet. This is a part that has a high rate of failure.


Dec 01, 2008 | Goodman Heating & Cooling

3 Answers

My goodman gmt090-4 shuts off about 10 sec. after burners ignite

Check the pressure sensor. I tapped on mine a few times, removed the hose and checked it for blockage and replaced. It has been working fine since. I do have a new sensor on order.

Oct 04, 2008 | Goodman GMS90703BXA Heater

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