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Furnace code light flashes 3 times /pressure switch stuck open

I try to turn on my furnace and i get a flashing code
furnace wont turn on / pressure switch stuck open what should i do

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  • Anonymous Jan 19, 2009

    i have the same problem

  • Anonymous Jan 20, 2009

    Hey I had same problem with my funace this morning. First I checked pressure switch by pulling hose of and softly suckin to listen for click. Mine was fine, the purge motor was operating like it was supposed to ( the little motor that removes gases from furnace chamber) . Next thing I checked was the problem. The air intake plumbing had ice and snow blocking it. I cleaned it out and the problem was solved. My furnace is a 90+ effeciency so the intake and exhaust plumbing is easy to follow out and is within reach. Hope this helps.

  • gazzer69 Apr 05, 2009

    My furnace will not turn on. I can hear the draft fan running and there is negative pressure at the intake pipe and positve pressure outside. I am getting a flash code of 3 but both pressure sensors where checkedto be okay using a DVOM. After a shut down of the furnace's power I can hear the draft fan start up and the HSI heats to a bright orange but about 7 seconds later the HSI goes out and the flash code 3 returns. What I am missing here? Please help.



    Garry

  • Anonymous Mar 16, 2014

    Ducane furnace code lite 3

  • Anonymous Mar 16, 2014

    Cleared out a code 3 but now have constant flashing CODE call for heat????

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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.

Posted on Jan 20, 2009

  • Rob Sloan
    Rob Sloan Mar 16, 2014

    I got the clicking sound and took advice but the 3 lite code stopped now I have a constant flashing code says fast heartbeat call for heat????HELP PLEASE!!!

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3 Flashes means pressure switch malfunction......had the same 3 flashes and when i changed the pressure switch all was well and good.
Alan
Terrace BC

Posted on Jan 15, 2010

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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.
themobilian_3094.jpg

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boilerman56

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A sampling of various codes on a furnace

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 Goodman 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.

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Error Codes
A green LED indicates system faults
Steady On: System OK
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2 Flashes: Pressure switch fault, fails open (switch is
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3 Flashes: Limit switch open (main or auxiliary)
4 Flashes: Pressure switch fault, fails closed (switch is
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A yellow LED indicates flame status
Steady on: Normal flame is sensed
Flashes: As flame weakens, frequency of LED flashes
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