Staff Answer
Sep 28, 2026 - 07:40 AM
With the burner, electrode and board all replaced, a popping flame usually comes down to the flue and draft. Brush the flue clean, make sure the baffle is in place, and check that the burner is centered under the flue. Also check that the orifice is the correct one for the 1200 and that the LP pressure is right. Wind through the lower vent can cause popping, too.
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