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Furnace motor turns on but ignitor will not ignite. I took drain hose off once and ignitor fired up and furnace ran. i turned furnace off to see if problem was corrected and it happened again.

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  • Anonymous Jan 18, 2009

    HEATER IS BLOWING SOLD AIR LOOKS LIKE THE IGNITER IS NOT LIT HOW DO YOU LITE

    MODEL # M3RL080A

    SER #M3A070600579

  • Danny Clark
    Danny Clark May 11, 2010

    Which drain hose are you reffering to?

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Sometimes the condensate lines can vapor lock of condensing style furnaces. Check all rubber lines. Make sure they are all snug and in place.

Posted on Jan 17, 2009

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Plot light will not stay on long enough to start burners


Probably neds confirmation of ignition. Clean up the spark ignition sensor and retry. Their are more than one type of electronic ignition. The direct spark older type pilot light the pilot then confirms it is lit back to the control then the man gas is allowed to come on. Newer furnaces have a draft maotor that sucks a hose and trips a switch to prove the motor is running then the ignitor is allowed to come on, after a few moments the fire is turned on. At that moment in time the flame washes in the flame sensor. That gives the control confirmation of ignition. If eithr of these type systems are dusty or greasy or rusty they cannot confirm ignition. So use some sand cloth to clean them puppys and party on.

Oct 26, 2012 | Dayton Gas Furnace Heater

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I have a goodman high efficiency furnace, model gms9/gcs9. I've had several furnace techs look at it scratching thier heads. It won't fire up, the ignitor comes on but won't flame the unit. I...


check to see that your condensate line is not plugged. next check the p-trap where your line goes in. also check your flue abs flue pipe see as it comes out of roof is it open or does it have an elbow coming off of it i usually install with elbow preferably less water goes in the units resevoir hope that helps u

Apr 04, 2012 | Goodman Heating & Cooling

1 Answer

Why heater coils glow?


It sounds like you're describing one of two things. The hot surface ignitor in a gas-fired furnace, or the resistive heat strips in an electric furnace.

The hot surface ignitor in a gas-fired furnace lights the burners. This ignitor in modern furnaces serves the same purpose as the standing pilot flame did in older furnaces. It provides the required heat to ignite the gas at the burners. Without an ignition source, a gas-fired furnace cannot provide heat. When the ignitor is activated it will glow bright orange or yellow.

The resistive heat strips in an electric furnace actually provide the heat to a home or building. When the furnace turns on, the heat strips are activated and usually glow orange when they reach peak temperature. In almost all cases, the heat strips are not easily seen or accessed without removing covers or panels inside the furnace.

Feb 28, 2011 | Heating & Cooling

1 Answer

We bought a duplex and it has a Payne furnace from 2007. No paperwork. The lower unit suddenly shut off. The furnace has a blinking red light and now has no heat blowing to it. Is there anything we can...


yes you can unplug furnace for about 20 seconds and replug then start up unit... a common problem with alot of furnaces this time of year is the hot surface ignitor fails which is the glow plug on the unit .. the unit when called for heat should start a small motor with a wheel on it known as the enducer draft motor then activates the round switch with the plastic hose connected to it...make sure the hose is not kinked or obstructed...pull the end off opposite of the round switch if you **** on the hose should here a clicking sound.. reconnect after the switch has closed then the power is sent over to a ignitor on most furnaces some have spark ignition but either way that is the next step after the ignitor glows red hot then the gas valve should open and fire off ..after it lites there is a flame sensor a metal rod that is in the direct path of the flame that measures current and keeps gas valve open once unit reaches temperature a limit will activate the blower to come on....where does it fail ... most units with a led code will have a sticker attached to the door outer or inner door with code meaning... count the flashes and then look for code...hope this helps out

Jan 25, 2011 | Heating & Cooling

1 Answer

My furnace is flashing 21 green and then it flashes red ...the furance will not run . I have replaced the thermostat and cleaned tha condensate drain


not sure what 21 is ,but if you are getting acode normally the code comments are on the door or the manufacture lable to tell you what they are...
i can tell you the operation and maybe that will help you out...
the unit should start off with the enducer draft motor small motor in furnace that pulls all the stale air out..then the negative pressure switch activates which should have a hose coming from the enducer draft moto to the pressure switch..once the pressure switch closes it sends power to the ignitor and the ignitor should glow once it gets hot a milivolt current is sent back to the gas valve and it opens up and fires...after it fires you should have a flame sensor small metal rod in the direct path of flame that keep sensing the flame and sends signal back to board.... unplug unit and watch it start where is it failing or in what part of the operation does it flash a code....

Jan 03, 2011 | American Standard Heating & Cooling

1 Answer

It does not fire at all times igniter works, I can hear the gas valve when opens, some times it fires for a minute and some times does not fire at all


Problem: Your furnace will not ignite the gas to produce heat for your home. When a furnace has a bad ignitor what I see most of the time is the following sequence of operation:


1. Thermostat calls for heat. 2. Draft inducer motor starts. 3. Pressure switch attached by a small plastic or rubber tube senses the negative pressure produced by the draft inducer and closes. 4. Draft inducer runs for 30 seconds to a minute before you hear a gas hissing sound. The ignitor did not glow, the flame sensor (a small metal probe about 1/8" in diameter, with a white porcelain base) does not sense the flame, so after 8 to 10 seconds the hissing sounds stops with no ignition of gas to heat your home. Your furnace shuts down and goes into a lock out condition until you turn your power switch back off and on again. Then the sequence starts all over again with no ignition of the gas. Solution:You probably need to purchase and install a new ignitor. I would suggest that you inspect your ignitor closely for cracks. Make sure you do not touch the ignitor with your bare hands. If you do not visually see a crack, then you could have a furnace control board problem or a limit, rollout switch problem. The furnace's control board might not be supplying the voltage to the ignitor. If your furnace lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then you need to clean your flame sensor with light sand paper or steel wool. You might need a new flame sensor, but most of the time they can be cleaned an will work well after cleaning.

Dec 07, 2010 | Heating & Cooling

1 Answer

Gas Furnace Will not light


Hi, normally when you turn the gas off at the flex line valve and leave it off for awhile, the gas has to clear the gas valve and lines up to the pilot. Purge its self of air before it will light again. It will take the electronic ignition several clicks and more before there is enough gas to light the pilot and then open the main gas valve to fire the burners. Tell me, what kind of gas furnace is this when you speak of water? you say the site glass was full and you had to drain it and then the ignitor kept on clicking when it normally only took one click to light it. Please let me know the style as in a split system, a package unit, all in one, or what you have. I will wait to hear back from you. If the pilot does not light right away, then yes let it continue to click and see if it will light. On a heater with the electronic ignition control module on it or a circuit board, this is what tells the pilot coil to energize to light the pilot. It will send power to the pilot coil to open and let gas through to light and same for the main gas valve, will get a signal to open when the pilot is on. It will not open unless the pilot is lite for saftey. I will wait for you're responce.
Shastalaker7

Nov 27, 2009 | Honeywell CT87B ROUND HEATING&COOLING...

1 Answer

Gas Furnace is not heating anymore.


the fan you hear come on at a call for heat is most likely just the inducer motor. the click you hear is probably the relay for the hot surface ignitor which should glow red, then in turn ignite the main burners. your going to have to determine if the ignitor is coming on. if it isnt the ignitor is bad and will need to be replaced. if it comes on and than shuts off after a few seconds the ifc board is probably at fault

Apr 09, 2009 | Heating & Cooling

1 Answer

Running out of LP??


Yes. The ignitor is trying to find fire and it can't. That's an ignition error. It should go away once you get fire to the sensors. You might have to hit a reset button, it all depends on the heater.

Feb 05, 2009 | Coleman Propane Forced Air Heater...

1 Answer

Furnace gas valve wont open (roll out switch failure)


Sequence of operation, Gas Furnace.

On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the ignitor. The ignitor will glow and you will be able to see it if viewed thru the small inspection port. Once the ignitor gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the ignitor does not energize (bad control, bad ignitor), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not lite (dirty pilot), the burner does not lite (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Most newer furnaces will have a diagnostic center or control built into the control module. You may be able to view it as it is running thru a small viewing port. Some models will require the removal of an access panel prior to finding it. On the reverse of the access panel, there will be a diagnostic chart that will aide you in understanding any error code recorded (usually a blinking light).

This is why we technicians earn the big bucks!

Dec 04, 2008 | Goodman GMS90703BXA Heater

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