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We have an American Standard YCD240B3HAJB that will not ignite on start up every time. When it does it will shut down intermittently. We have tried testing everything we can think of and replaced the board and igniter. If someone has an idea let me know I am at my wits end.

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Try using a jumper wire between w and red on the stat subbase. that will take the stat out of the equation , if it has a bad heat anticipator etc. if furnace fires every time and stays on stat is the problem be sure glow ignitor is positioned in the flame after lighting as it proofs flame on some models . also look for a needle like sensor sticking into the flame on some it also proofs flame. you can gently remove and clean with sand cloth and theyll work sometimes but best to replace if to coroded.

Posted on Oct 10, 2008


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