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Trane furnace 3 blink - pressure switch

I have notice liquid in the plastic tubes connected to the pressure switch. Is this the problem

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  • mirekkolar Dec 20, 2008

    Blower motor is now working, but the furnace will not turn the burner

  • Anonymous Jan 01, 2009

    i have the same issue



  • Ken Bledsoe May 11, 2010

    Does the hot surface ignitor glow? Or do you hear a small clicking noise?

  • Ken Bledsoe May 11, 2010

    Yes it is need to clear out liquid.

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Check p-trap, check and clear rubber elbow @ inducer motor condensate outlet. Verify water drains to outside primary drain.

Posted on Apr 07, 2009

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Rheem Classic 90 FURNACE. Blower motor constantly running, even if t-stat is removed. Led blinks four times. PS closed, is the code. Not a psycho problem, I think it is the voltage transformer.


An LED that blinks four times followed by a two-second pause is signaling the pressure switch is closed when it should be open. The switch itself might be stuck, or the tubing that attaches the switch to the furnace's draft inducer might be blocked

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1 Answer

Furnace will not ignite.


I think you are talking about draft induction pressure switch operation. Make sure the metal orifice located on the draft induction blower is clear. To check, remove the rubber tubing end at the pressure switch and blow into the tubing. It should be easy to blow through it. If it is plugged, remove the tubing from the blower orfice and use a paperclip, inserting it into the orfice to clear the opening. After repairing, and all is hooked up, retry the furnace start up procedure. If the code comes up again, replace the pressure switch.

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Furnace will not light


Most furnaces can be reset by turning the power off and back on.
The pressure switch senses pressures in the furnace to make sure the exhaust fan or draft inducer is operating properly. if not the furnace shuts down. check the inlet and exhaust terminals outside for obstructions (I.E: leaves,frost or snow) check the drains to make sure they are not clogged . Hope this helps.

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1 Answer

Hi :) I have the Trane Furnace that just turn on


on older tranes if 120v power is reversed it would do that try switching leads on pigtail to board. make sure to unplug first!

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I have an amana dms 90904cms furnace ..the fan runs but no heat. I opened cover and saw the red led blinking 3 times code says open pressure switch. what does that mean?


Open pressure switch is when your vent motor comes on it has to get a certain vacuum pressure or it won't ignite furnace. There should be some little black hoses connected to vent motor and maybe into heat exchanger, running to these pressure switches. Pull hose off one end and make sure hoses are not kinked or some times if hoses have sag in them they can fill with water. Other causes are if venting is obstructed or pressure switch is defective, especially if it got moisture in it.

Jan 26, 2011 | Air Conditioners

1 Answer

Furnace will not ignite. Inducer motor and blower motor kick on at the same time. Safety switches have been checked. Circuit board and igniter assembly is good.


what brand furnace is it? is there any blinking light on the control board? is the tube going to the pressure switch blocked? there should be a tube going from the pressureswitch to the inducer motor housing take it loose from the inducer and check for obstruction there,dont blow back into the switch.

Dec 11, 2010 | Air Conditioners

1 Answer

Furnace blows cold air, ignitor won't glow.


ok this is going to sound funny but it seems as though the polarity is reversed going into your furnance. to correct this proiblem you first need to unplug the unit and where the cord goes into the furnance at that connection disconnect the two wires. Once theses are disconnected switch the wires .All you are doing is reversing the way the electricity flows into the circut board. I would wager that is the problem

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1 Answer

Furnace wont run


First of all when you flip the switch, it goes thru a startup sequence. THEN it turns on the Igniter (notice the red glow). Then the gas turns on.

Now at this point check the idiot light and it should be giving you a code of 34. That 34 (3 shorts 4 longs) says that there was a problem igniting the furnace. After it cycles thru at least 4 times and fails to ignite all the blowers, then is when you get a code 14 (1 short 3 longs)

NOTICE what's happening with ALL the burner Tubes each time it attempts to ignite. If only one or two are running....then this is your problem.
To fix all you do is take out the burner Tubes, look for debris, blow them out (blow from the front where all the jets are), and replace them in sequence from left to right (the tabs overlap).


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1 Answer

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check the pressue switch and make sure that nothing is in the fan that would cause it to not draw. I have seen water inside of them at times due to the high efficentcy of the units. let me know if this does not solve it please.

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1 Answer

Goodman GMS90904CXA Wont ignite, light blinks 3 times


I had the same problem, I had to remove the lower black rubber stopper right next to the exaust fan and hook up a drain to the unit, as soon as the water drained out the furnace fired right up.

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