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The Goodman B4022700 is a genuine OEM 3-inch in-shot gas burner for the AMS80403AXAD 80% AFUE furnace and compatible Goodman/Amana models. In-shot burners deliver the gas/air mixture into each heat-exchanger tube; this replacement restores clean, even ignition across the burner rack.
Rusted, sooted, or misaligned burners cause delayed ignition, roll-out, uneven flame, and lockout faults. Furnaces use one burner per heat-exchanger cell, so replacing worn burners as a matched set is recommended for consistent flame carry-over.
Genuine Goodman burners have the correct venturi shape and orifice alignment for proper flame velocity and clean burn. Off-brand burners can seat incorrectly, causing flame roll-out or CO issues. With combustion parts, exact OEM geometry is a safety matter — always choose the factory burner.
Moderate (3/5). Shut off gas and power, remove the burner assembly bracket, slide the old burner off its locating tabs, install the new burner in the same position, and reassemble. Verify burner-to-orifice alignment and confirm a crisp blue flame with no roll-out. If unsure, have a licensed HVAC technician perform combustion service.