Two things Mike, Take a piece of steel wool and clean the flame sensor rod that is located on the burner rail,either on the far right burner or the far left burner. It looks like a peice of 10 gauge wire sticking up about an inch. When this flame sensor gets a bit moist it will get abit of rust on it and it can't feel the flame so the flame goes out... blower continues to run..cold air.. Or #2 is limit switch bad!! Limit switch detects heat and turns on blower. If it just turns on blower without feeling any heat... it's bad.Limit swicth is cheap and easy to replace..Take Care Jack
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