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Old 02-07-2013, 07:53   #4
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Join Date: Aug 2009
Location: Illinois
Posts: 888
Is this propane gas by chance? It sounds like you have a rich fuel/air mixture at your flame. Why, I don't know. Maybe you need more air at ignition, or as stated your furnace is not drafting properly. Somewhere I heard this sensor buildup can be a problem in a home where candles are burned.
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