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Turned on furnace no heat was coming out, but the pressure switch says its stuck open. what do i do?

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  • tt_1125 Nov 17, 2008

    We are having the same problem. Did you happen to get your problem fixed?

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Call a pro to replace the blower, or the draft induced motor or the switch. gas is nothing to play with.

Posted on Oct 19, 2008

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My nordyne m1 mb 056a bw heater isnt working...a red light flashes twice, which means "Pressure switch is open"...how do i fix it?


First, I am assuming that this is a residential gas fired furnace. 1. The first thing that will happen once the furnace gets a call for heat is the small draft inducer motor will come on. 2. The pressure switch should close. If the switch is not closing, here is a list of possible reasons: 1. The draft inducer motor is not running. 2. There is a restriction in the flue or heat exchanger. 3. The tubing from the pressure switch is not connected or has a leak. 4. The pressure switch may be defective or stuck open. Note: this is not an exhaustive list, but should cover the most common causes. Also, you may have to unplug the furnace and then plug it back in before it will try to come on. It may be locked out on the control board because of the pressure switch fault. I hope this helps!

Nov 30, 2015 | Heating & Cooling

1 Answer

Furnace will not light


If the inducer runs for a short time and shuts off and the main blower comes on and runs it could be a high limit switch or a roll out switch.it could also be a pressure switch that is stuck in the closed position. Most new furnaces have to read the pressure switch in the open position and then the closed position after the inducer fan starts. . Hope this helps.

Dec 17, 2013 | Heating & Cooling

1 Answer

Goodman Gas Heating A/GPG13 Not Heating - Pressure Switch Stuck Open


Clear the little hole where that hose go to the inducer case

Feb 10, 2013 | Goodman Manufacturing Goodman...

1 Answer

My ruud furnace pressure switch is stuck open


Hi.
If it is stuck open you will need to replace the switch....

Here is a tip that will help you try to figure out why your furnace is not working.

Basic Furnace or Heating System Troubleshooting

heatman101

Dec 27, 2010 | Dayton Gas Furnace Heater

2 Answers

Goodman 95 %furnace keeps saying low pressure is stuck. changed out low pressure switch and high pressure switch and still have same problem.


That thang might be sensing a lazy flame. In other words the flames took too long in the board's opinion to quit sensing the flame. Yall probably need to do pressure tap on the gas valve.
Here is a realistic look at goodman fault codes and what to check fer and I am assuming you are not a tech and don't know this already and am hoping it helps:


Read one LED flash that stays on continuously to mean your furnace has no signal coming from the thermostat and will not operate. Turn the power off and check the thermostat for improper settings or connections.

Interpret one LED flash that blinks on and off to mean your furnace has locked out because it could not ignite after three tries, and must be reset. Interrupt power to your furnace for 20 seconds or lower the thermostat so your furnace does not try to heat, then reset the thermostat to the previous setting. After one hour of lockout, your furnace will automatically reset itself and try to operate as usual.

Decipher two LED flashes to mean the draft blower is not working, or your furnace has a short in the pressure switch circuit. Turn off the furnace power and repair a short or replace the pressure switch.


Read three LED flashes to mean your furnace has an open pressure switch circuit or it has an induced draft blower operating. Check the pressure switch hose of your furnace for blocks or an improper connection. Also, look for blockages in the flue, and tighten any loose wiring.

Translate four LED flashes to mean your furnace has a primary limit circuit open, possibly from loose wiring or blocked filters. Check and clean filters, tighten wiring and check the flue for blockages.

Interpret five LED flashes to mean your furnace senses a flame without a call for heat. This could be from a gas valve closing slowly or a burner flame lingering.



Read seven LED flashes as a warning of a low flame sense microamp signal. This could happen with a coated flame sensor or a lazy flame from poor gas pressure. Turn off the power and adjust the gas pressure according to the information on the rating plate.



See eight LED flashes as meaning an igniter circuit problem due to a bad igniter or an igniter connected improperly. Replace the bad igniter or check the ground wiring, making necessary corrections.



Decipher nine LED flashes to mean the high-stage pressure switch circuit will not close during a high-stage-induced draft blower operation. Your furnace may have a pinched or blocked pressure switch hose, a blocked flue or loose wiring.

Read continuous flashing on the LED to mean your furnace has a reversed polarity of 115 volts. Turn off the power and correct the wiring polarity after reviewing the wiring diagram.

Now here is how it should all go down:



Bottom dollar: it all goes back to type of gas, the initial setup, the pressure tap. and how it is wired up to begin with.
This will give you an idea where to start I hope.

Dec 10, 2010 | Goodman GMS80903BNA Heater

2 Answers

Hello. I have a Goodman furnace model no. GDS80453AMA. The furnace indicator light is blinking 3 times, which according to the schematic, is "pressure switch stuck open". Previously I've had the furnace...


The pressure switch requires a negative pressure (vacuum) to close the contacts. It is measuring the pressure in the inducer and indirectly ensure there is good combustion airflow throught the heat exchanger. Check for a small vacuum, in the neighborhood of 1" water column. Usually the vacuum required to close the switch is stamped on the vacuum switch. Check the vent pipe for obstructions and correct size and installation.
If the pressure aka vacuum switch does not close the furnace will not continue with ignition, for safety reasons.

Oct 18, 2010 | Goodman GMS80453ANA Open Flame Mid-Size...

1 Answer

My furnace isnt working the trouble light code says pressure switch stuck open or closed


The pressure switch, open or closed depends on the induce fan motor. the switch could of failed. Try blowing into it, in and out. And or your induce fan motor is not blowing out the excessive heat out of the furnace properly. We provide repairs in the So Cal Area.

Oct 07, 2010 | Heating & Cooling

2 Answers

Furnace not kicking on


Kill power to furnace and retry heat. Sometimes high winds will cause a back pressure. That will cause the switch not to work. Also is the fan coming on when it calls for heat. If not check power at the board. You have two wires that go to the draftmotor. They should have 115 volts going to them. But try killing power to unit first. rus Keep in thuch.

Dec 16, 2009 | Goodman GMS90703BXA Heater

2 Answers

Furnace code light flashes 3 times /pressure switch stuck open


Check the intake and exhaust plumbing for any obstructions. I had same issue, turned out to be ice in the air intake plumbing on outside of house. This may be the problem. The pressure switch can be tested by pulling hose from purge motor that goes to switch and applying a small amount of suction. The switch should make a clicking sound.

Dec 19, 2008 | Kitchen Appliances - Others

2 Answers

Janitrol/Goodman GMP075-3 Draft Inducer Fan Won't come on


most forced draft fans are powered by 120 volts . close to the fan is usually a plug that unsnaps. create a call for heat after turning off to clear safetys and see if your getting 120 to fan on initial call for heat. if you are then fan draft motor is bad, usually sold as an entire assembly replace exact as it came out. sequence of operation is..... stat calls for heat via common and white wire to furnace , 24 volts. ......board sences call and sends 120 volts to forced draft ........ motor runs and creates pressure on proofing switch,....... switch closes 24 to board and tells it draft fan is on......... board then energizes ignitor,....... after ignitior glows gas valve is opened and burner lights ........ either ignitor or seperate sensor rod tells board the burner lit........ and a few minutes later the fan comes on and hot air is blown out. if a step is missed or doesn't proof the furnace either trys up to three times to light or locks out. turning off power usually resets safetys and it will resume attempts to lite normally.

Oct 25, 2008 | Heating & Cooling

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