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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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  • 4 Answers

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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3 FLASHES... PAGE 21 (below)

Pressure switch problem:

1. Obstructions or restrictions
in appliance air intake or flue
outlet are preventing proper
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2. Moisture or debris in tubing that
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http://homeappliance.manualsonline.com/manuals/mfg/sterling_1/tf250.html

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"switch stuck open"


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Janitrol furnace-circuit board code giving 3 blinks vent pressure switch or vent blockage where do i check on system / furnace was running fine up to this point /turned it off for about 1hr. and when i...


f this is a metal vent 80% furnace,Turn Furnace off
and remove the vent that connects to furnace and see if it is plugged.

If this is a High Eff furnace witrh pvc vents for
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Getting 3 blinks on error code LED, checked voltage at the pressure switch, and it is getting ~24v from both wires. What else could cause a "pressure switch stuck open" error code?


i take it the flash code 3 blinks refers you to the pressure switch...see the schematic. If this is what you are saying than lets move on... the voltage across the pressure switch should read 0 if the furnace is running and calling for heat. you dont need to check each wire to ground but across the two quick connect tabs. you will either read 0 or 24 volts (or there about). if you read 0 the switch is closed and functioning as designed. if it reads 24 volts it is open and there is not enough negitive pressure to close it. this can be due to a leak in the rubber tubing or a clog in the pressure switch, tubing, or induced fan housing connection nipple. the flue pipe may also be clogged or an improper cap is used at the termination. last is the wiring could be faulty going to and from the pressure switch. Hardly ever have we found a broken or faulty switch but it could happen. trust the board in most cases.

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I get 4 blinks it say open limit switch what does that mean


Your induce fan motor senor is out. The little fan motor that take out the heat has a sensor that tells the furnace thats its working. Some time it get stuck. Try blowing and sucking into the tube. you should hear a click

www.fastacservice.com

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I have a Goodman GMP075-3 REV. A and just yesterday it stop working. I am getting 3 blinks on the indicator light.It say that the pressure switch failure to close. I don't know it's located to check it.


the switch should be mounted in the same area as the burners. there should be a couple of hoses that run to it. most likely is that the intake or exhaust is plugged with frost or there could be standing water inside one of those pipes that has started to sag due to improper bracing and support. in other words, check the venting of the furnace. occasionally water can collect in the small tubes going to the pressure switch. the furnace drain has a tendency to plug up with gunk especially in the trap( a little black or gray plastic box with several hoses attached to it). it will most likely be in one of those areas.

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Furnace blows cold air, ignitor won't glow.


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