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I have a problem with an Armstrong SX90 gas furnace. model GUK100D14-2B serial number 8497G26541 The ignitor is not 'glowing' and therefore the pilot won't light. Everything seems to be sequencing okay...the blower starts and you can hear the gas valve click when the ignitor should glow but no glow....any ideas?

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Buy a new ignitor either from the ignitor store online, or your local distributer, Contracter, dealer.. they usually run from 15 dollars to 35. Their simple to change out and deffinite do it yourselfer... Oh and turn off power at breaker panel, you don't need any unexpected surprises!!

Posted on Dec 02, 2008

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My Amana GUI090B30B furnace will not ignite. The ignitor glows then the valve releases gas but the gas does not ignite. The ignitor goes out and the valve shuts after a second or two of trying to ignite...


Hello, it is possible that even tnough the ignitor is glowing it might be too weak to ignite the burners. I would cneck the resistance of the ignitor with a multmeter, should be between 40-90 ohms typically

Nov 28, 2011 | Heating & Cooling

1 Answer

The fan blows but the igniter does not light.


When a furnace has a bad ignitor what I see most of the time is the following sequence of operation:


1. On a call for heat
2.The draft inducer motor starts.

3.The pressure switch which has a small plastic or rubber tube attached yo it senses the negative pressure produced by the draft inducer and closes.

4.The draft inducer runs for 30 seconds to a minute before you hear the gas making a hissing sound. The ignitor did not glow,therefore 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 gas 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. Please Make sure you do not touch the ignitor with your bare hands. If you do not visually see a crack, then you could possibly have a furnace control board problem or a bad limit switch or rollout switch problem.

Mar 10, 2011 | 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

Furnance blows out cold air


Your problem is listed under Air Conditioners--
So is your furnace gas fired, oil fired-- or possibly a Heat pump?

Heat pumps have a hard time getting any heat from outside, when it is bitter cold out-- could that be a clue?

If you have gas-- Does your furnace have a standing pilot?-- if so, when was the Thermocouple last changed?
If it has a glow ignitor-- is the ignitor glowing brightly on start up?

If oil, do you have both oil and spark-- right at the nozzle tip-

Please tell us more, so we can help you more.

Mack B

Jan 23, 2011 | Heating & Cooling

1 Answer

Ten yr old Goodman residential furnace won't light even though hot surface ignitor glows red for 1 or 2 seconds.


Make sure you have gas on. Tap on the valve as the ignitor glows. The valve may just be stuck. If not- I'm thinking the funace needs a new ignition module.

Jan 17, 2011 | Heating & Cooling

2 Answers

I have a goodman furnace, the ignitor glows gas lights and then burns only a short time and then goes out, this hapens 3 times then furnace cycles out and I get a blinking light,


Do you have Natural Gas, or LP Gas (Propane)
Do you have any other gas appliances?- like an oven?
Do you have gas at the other appliances?

The Ignitor getting bright, and cycling 3 times is a normal number of 'LIGHT' attempts -- and shows that you do have a good ignitor- That is important! and that is GOOD!

However-- it sounds like you have NO GAS.-- Is that possible?
If you do have gas in the kitchen, then either the manual Shut off valve is shut to this appliance, or the main gas valve is not opening --- for any of a number of reasons-

Tell us more about what you do have in other appliances.

Mack B

Dec 28, 2010 | Goodman Heating & Cooling

1 Answer

Rheem Furnace sometimes takes a couple of ignition cycles before


Try cleaning the flame sensor. It is located right besides the last burner. Looks like a thick piece of wire. Take steel wool and gently remove the carbon that has built up. Should only take 4 or 5 strokes. Let me know how it goes after that. ken

Dec 23, 2008 | Heating & Cooling

1 Answer

No ignition


Yes. Gas ignitors either spark or glow. Find a way to look at the ignitor, even if you have to use a mirror. If it sparks or glows, figure out why the gas isn't getting into contact with the ignitor. If it doesn't spark or glow, the ignitor is probably bad, but the controller might not be sending it electricity (bad controller). This is what electrical meters are for. Checking for voltage at the ignitor will tell you if the controller is telling it to ignite.

Jul 22, 2008 | Goodman Heating & Cooling

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