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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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Posted on Jan 02, 2017

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You have a bad ignitor to your oven. Part number you should replace is 12400035. This should fix this problem. Just because it glows does not mean it work correctly, it works off of the flow of electricity rather then the glow of the ignitor.
Ignitor How to test How to change ignitor
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I have a armstrong gas furnace and I would like a wiring diagram for it it is a model mg73140


http://www.armstrongair.com/armstrong-links/

from here select the particular furnace that you have this is the only resource the is avail. due to the furnace being a Lennox made furnace

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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.

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For more detailed information, click HERE.

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