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I have a Rheem criterion gas furnace that, now that the temps have hit in the low 30s, has decided not to light. It cycles through with the induction fan kicking in just fine, the hsi glows... But it only glows bright red in a single spot on the ceramic "m" about the size of a carpenter's pencil lead. The entire arm does not glow as i was under the impression should happen. Am i wrong? But... Moving along... As the small spot glows, i can hear the gas valve open and shortly after the main blower kicks in... As it should. But no heat of course because the gas never lit. my main question is... Being that the entire arm of the hsi is not glowing... Just the small spot... Is that an indicator of it being or going bad, preventing it from creating enough hot surface area for the gas to hit and ignite? I appreciate any and all help you can provide. Thank you.

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The entire igniter should glow, if it does not the temp to ignite the gas is not met and the burners will never light. When replacing the igniter never touch the element part becuae it will create a hot spot on the igniter and fail.

Posted on Dec 11, 2012

  • david_hill26
    david_hill26 Dec 11, 2012

    That's what I was thinking. So I went upstairs and read all of the warning labels about NOT applying a flame to the gas source... and then held a match next to the ignitor as the valve opened. Lo and Behold, it has been running beautifully for about 25 minutes. So that confirms it in my mind. I need a new ignitor. Now begins the joy of trying to find a local dealer that will sell me just the part without troubleshooting it themselves.

  • Robert Dec 11, 2012

    You can purchase the igniter online, the only problem is that you have to wait for it to come in the mail. The other option is goimg to a Johnstone suppy and buying it there.

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SOURCE: Goodman GMP075-3 not igniting. Everything cycles

The flash code is due to the furnace not proving flame 3 times in a row. If you have a multimeter you can ohm the ignitor out to see if it is good. Depending on the type (silicon Nitride or silicon Carbide) you can verify if it is good. A silicon Nitride ignitor looks like a small thin straight bar type will ohm @ 11 - 18 ohms, a carbide ignitor looks kinda like a tuning fork (sorta) will typically ohm @ 40 - 92 ohms. anything outside of those ranges will require a replacement.

Posted on Nov 02, 2010

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