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Yu have a sticking sequencer that will have to be replaced.Give me a moment and I will get you a part number if you want to replace it yourself.
Your furnace has two sequencers. I recommend replacing both because if one is bad, the other is likely to follow.
Part numbers are 42-23116-07 and 42-23116-09
You can get them from Amazon
If you have further questions, please let me know.
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