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The Goodman B1809913S Integrated Furnace Control Board is the genuine OEM ignition and sequencing brain for the GMNT090-3B gas furnace. It manages the ignition sequence, blower and inducer timing, safety-circuit monitoring, and diagnostic fault codes. This board ships with the 9-pin harness for a direct, correctly-keyed connection to the furnace wiring.
Control boards are firmware- and timing-specific. The OEM B1809913S guarantees the correct ignition sequence, relay ratings, and connector keying for your furnace. Generic or cross-referenced boards can introduce timing mismatches, nuisance lockouts, or connector incompatibility. For a control board, we strongly recommend the exact OEM part.
Moderate (3/5). Roughly 30–45 minutes. Photograph all wiring before removal, transfer connectors one at a time to the new board, and confirm dip-switch/jumper settings match the original. Requires basic electrical familiarity. Shut off power and gas before starting; if you are unsure, use a licensed HVAC technician.
Compatibility note: Confirm the part number printed on your existing board matches B1809913S before ordering, as furnace revisions can use different controls.