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All burners will not light on Goodman furnace

I have a Goodman GMNT060-3 about 6 years old. All 3 burners will eventually light but only after having the furnace cycled multiple times. On occasion, it will be fine, but that is rare. I have replaced the flame sensor and have removed the manifold and orifices and cleaned them both (removed orifices from manifold). The first burner only lights a majority of the time. When all 3 burners eventually fire, I can hear the first one light and then a pause and then a woosh like the gas had built up in the manifold and was forced thru. I was assuming the gas valve was bad but someone else said the circuit board could be it. Any suggestions?

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I have had problems like this before. Most of the time it is the connection between the burners. There are small slots that the gas runs thru to lite. Clean those with a brush and then try it. Rus

Posted on Oct 04, 2009

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