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I have a armstrong gas furnace that does not work. Currently it is flashing a 3 trouble code which is pressure switch is on with inducer on. How to correct the problem

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  • Heating & Co... Master
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You will have to change the pressure switch no qouick fix with this sorry

Posted on Sep 28, 2010

  • cbamf7 Dec 20, 2010

    Go out side and clean out your air intake outake pipes for the furnace mine shuts off all the time everyday actually and I have to go outside and clean outt he snow because my furnace keeps shutting off !

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Trouble shooting your gas Furnace


If you are having trouble with you gas furnace they are really not that complicated to figure out. Most of the newer gas furnaces within the last 10+ years have a flash code on the circuit board inside the furnace. The trouble codes are in flashes. For example: 1 flash means ignition problem, 2 flashes mean vent pressure switch, 3 flashes means control board problem and so on. The first thing to do would be to check for a sight glass or window in the blower door to see if there is a flash code. Then you can pull off the blower door to check to see what the code represents. The code chart is usually located on the inside of the blower door.
If there is no flash type board in the furnace it still pretty simple to trouble shoot. First thing is verify that you have power to your furnace. You can do this by checking voltage with a simple meter. Check for voltage at the door switch since this is usally where the power starts. If there is power there then check for voltage at the thermostate between the R terminal and C for common. If there is power there then you need to go back to the furnace and try to figure out where the power is stopping. With the power to the furnace off start to check the safety switches. With an ohm meter or a test light you can start checking for continuity across your safety switchs. Check the roll out switch that is located near the burners if thats okay, Check the high limit that is usually located up higher on the front of the furnace that has two wires going to it, if that is okay then check your pressure switches and these you will have to check with the inducer or vent motor running. Hope that this information is helpful and if you don't feel comfortable using an electrical tester be sure to call in a professional HVAC Tech. to look at it.

on Dec 20, 2009 | Heating & Cooling

2 Answers

THE DRAFT BLOWER IS TURNING ON BUT NOT FIRING UP WORKING ALL DAY STOPPED OVERNITE


The induced draft motor has a induced draft proving switch that is a pressure switch , it resembles a silver round flat device about 4 inches across with 2 wires, it will have a tubing attached to it that also is attached to the induced draft assembly housing on a barbed port, this is how the induced draft is "proven" thus giving the A OK to go to the next sequence of operation which is ignition trial period, it will attempt a ignition sequence for about 30 seconds 3 times before it will lock out if it has a circuit board, if so a flashing code will be observed and the legend in the back side of the blower door will tell you the codes meaning.
What is wrong 80% of the time is the barbed port on the induced drafts assembly is obstructed by carbon and not allowing the pressure switch to "sense" / prove the induced draft motor is running. You can connect the pressure switches 2 wires after the induced draft begins, this simulates a operational pressure switch and should begin the ignition phase if all is well, otherwise if all safety's or high limits are closed, then the ignition module is bad.

This is for spark type, if you have a hot surface ignitor look to se if its broken or cracked or has a burned spot visible, if not try testing for 120 volts to it, if you read proper voltage, then the hot surface igniter is bad. 25360510-wil0gxehsfojcry3vcxysbjd-1-0.png

Jan 08, 2015 | Emerson Lennox Ducane Armstrong Furnace...

1 Answer

Furnace wont work


Have to know the model and serial of the furnace.
locate code list usually inside or on the back of a door.
Operation sequence= call for heat--inducer blower motor--makes pressure switch--signals board to bring on hsi--after a set time gas valve opens and you have ignition--main blower motor comes on after a set time

Feb 14, 2014 | Coleman 7990-319p Evcon Gas Furnace...

1 Answer

Armstrong GUK125D20-2B won't ignite


Did he check the Pressure switch was it filled whit water can you make the switch open on the pressure switch when blowing on it? Is the hose from the inducer motor opened and not blocked ? also if there is a block after the inducer motor it will not Ignite. If the Tech does not know how to check a pressure switch get a new tech.

Oct 06, 2012 | Honeywell Furnace Air Pressure Switch...

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

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 #...

2 Answers

Furnace won't stay running


1
1 FLASH
Furnace fails to operate.
• Integrated control module
diagnostic LED is
flashing ONE (1) flash.
• Furnace lockout due
to an excessive
number of ignition
“retries” (3 total)1.
• Failure to establish flame.
Cause may be no gas to
burners, front cover
pressure switch stuck open,
bad igniter or igniter
alignment, improper orifices,
or coated/oxidized or
improperly connected flame
sensor.
• Loss of flame after establishment.
Cause may be
interrupted gas supply, lazy
burner flames (improper gas
pressure or restriction in flue
and/or combustion air
piping), front cover pressure
switch opening, or improper
induced draft blower
performance.
• Locate and correct gas
interruption.
• Check front cover
pressure switch
operation (hose, wiring,
contact operation).
Correct if necessary.
• Replace or realign
igniter.
• Check flame sense
signal. Sand sensor if
coated and/or oxidized.
• Check flue piping for
blockage, proper
length, elbows, and
termination.
• Verify proper induced
draft blower performance.

Nov 23, 2008 | Goodman GMS90703BXA Heater

5 Answers

High limit switch open on armstrong furnace


If you know where the high limit switch is you can always cut the two wires and wire them together causing the limit to close. But what you have to watch out for is why the high limit is not closing. That means in your return air either you have a dirty return air duct, dirty filter, or you don't have all your registors open to allow the heat to escape the heat exchanger. Just watch over riding the system. The high limit switch should either be on or behind the blower, in the middle of the system right under the heat exchanger. any other questions about hvac just ask.

David

Mar 23, 2008 | Heating & Cooling

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