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I have a pretty new furnance 2 yrs old;however the fire from the burners aren't staying on due to the air from the blower. Brief description of what happens: the fire come on the the blower. It stays on for several minutes with heat blowing from the vents. When it goes off, it resets the fire comes back on from the burner. Then blower blows out the fire. What could it be. Please help