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

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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.

Posted on Oct 07, 2010

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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

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Do not get 24 volts from 120/24 volt transformer how test it?


Yes. There could be a couple of high limit safety devises in the circuit that can open the circuit to the gas valve. Pending your furnace type If your thermostat is calling for heat and the furnace tries to start your transformer is working. High limit safety controls are normally closed. If you have a open limit switch you will not have any continuity through it using an ohm meter or if you test it with a volt meter you will have 24 volts across the terminals of the safety devise. Other problems can be pressure switches, hot surface igniters and control boards. most newer furnaces have a control board that will flash a light code to help trouble shoot the system. Count the flash pattern and look on one of the furnace doors for the flash code directory.

Jan 01, 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

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

York furnace model p2mpd12h06401f flashes 4 times for trouble code does'nt have code list inductor motor comes on but ignitor does'nt come on


Check pressure switch for inducer motor. If switch closes, check for crack in ignitor. If gas valve opens and you can hear/smell gas, the ignitor is bad probably. If pressure switch isn't closed you need to check for blocked vent/chimney/heatexchangers.

Dec 18, 2009 | York Furnace Draft Inducer Blower Fasco #...

1 Answer

Meaning of rudd furnace trouble codes


Error Codes
A green LED indicates system faults
Steady On: System OK
Steady OFF: Board control fault or no power applied
1 Flash: Ignition failure (control in one-hour lockout)
2 Flashes: Pressure switch fault, fails open (switch is
stuck open)
3 Flashes: Limit switch open (main or auxiliary)
4 Flashes: Pressure switch fault, fails closed (switch is
stuck closed)
A yellow LED indicates flame status
Steady on: Normal flame is sensed
Flashes: As flame weakens, frequency of LED flashes
increases

Dec 12, 2009 | Heating & Cooling

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Heat not coming on carrier gas pack code 31


code 31 indicates pressure switch did not close or reopened during the heat cycle....1st thing to check is the inducer motor,,this is a small motor that turns a small blower wheel that draws the exhaust gases through the furnace and blows them into the vent pipe....1st locate the inducer assembly,,most easily identified by the small plastic fan blade that cools the inducer motor as it runs..1st turn off tstat and turn off furnace power switch..then turn on furnace switch,then set tstat to heat,set the temp above room temp by 5 degrees...remove the furnace front cover,locate the inducer motor,,if it isnt turning,but is warm or hot after a minute or so,likely the inducer motor is bad..if it isnt turning and isnt warm after 1 minute,then likely the main control board is bad,,not turning the inducer motor when it should,,,,,if the inducer motor is running,,then the pressure switch isnt closing,, could be a bad pressure switch but more likely there is a problem with the venting...some possible problems that would cause the pressure switch not to close in an 80% eff furnace [metal vent pipe] are: [1] a blockage in the vent pipe,base of chimney,dead bird at the furnace where vent connects to furnace or down inside the inducer assy,accessed by removing vent pipe from furnace....if all clear the chimney could be blocked up inside,,is the draft good when vent is removed from base of chimney?..if furnace is a 90%+ type [pvc plastic vent pipe],,then check the intake pipe at the furnace by removing it where it attaches to top of furnace..is the intake clogged with anything?..then check the intake and exhaust pipes outside for blockages,,including ice/frost/snow at the exhaust pipe outlet..

Jan 26, 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

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

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