Question about Goodman GMS90703BXA Heater

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My flame keeps going out. i can press the reset button and some times it will work for a week sometimes only 30 seconds. It is an intermittent igniter. The flame seems to "roll back" when it first kicks on. This only seems to happen when it is below 30 degrees outside.

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Your GMS unit should not be intermittent ignition but direct electronic ignition. In any case the flame should never roll out of the chamber. There can be a few reasons for the roll out but sometimes a good cleaning of the heat exchanger and a combustion analysis can cure that. The intermittent flame issue is probably a dirty flame sensor and can be cleaned with light sand paper or steel wool. Be careful not to touch the igniter only the flame sensor. It is usually on the opposite side of the burners from the ignition source. Hope this helps :)

Posted on Jan 03, 2011

  • Troy
    Troy Jan 04, 2011

    call your local furnace installation company,
    tell them you need furnace tune up.

  • SNARKY1 Feb 03, 2011

    Changed alot of heat exchangers on Goodmans, so throwing in my 2c.
    One simple thing I look at is how the burners look BEFORE the main blower starts. Does it look like flame is being sucked pretty into heat exchanger? Now watch when blower starts. Does flame roll out then? Does flame in one or more sections start to look lazy?

    If so, you probably have a cracked heat exchanger. A Carbon Monoxide detector stuck in the plenum right above the furnace BEFORE the blower starts should detect this also.

    Also, find out pressure switch rating, and check actual negative pressure from inducer with magnehelic gauge. Sometimes, inducers are weak. Enough to keep press switch happy, but weak enough to let burners trip a rollout switch sometimes.
    Or sometimes impeller on Inducer will get hot and spin on shaft intermittantly. Try catching THAT in the act!!!

    Also yes, dirty flame sensors are one of my #1 service calls on Goodmans. Clean em every call!

    Hope that helps.


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