{"product_id":"oem-goodman-integrated-furnace-control-board-for-gun100-4b-b1809904s","title":"OEM Goodman Integrated Furnace Control Board for GUN100-4B — B1809904S","description":"\u003cp\u003eThe Goodman \u003cstrong\u003eB1809904S Integrated Furnace Control Board\u003c\/strong\u003e is the genuine OEM replacement control module for the Goodman \u003cstrong\u003eGUN100-4B\u003c\/strong\u003e gas furnace. This board is the brain of the furnace — it manages the ignition sequence, blower timing, safety-circuit monitoring, and diagnostic fault codes. If your furnace won't ignite, short-cycles, throws blinking LED error codes, or the blower runs continuously, a failed control board is a common cause.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOEM Part Number: B1809904S\u003c\/li\u003e\n\u003cli\u003eCompatible Model: Goodman GUN100-4B (verify against your existing board)\u003c\/li\u003e\n\u003cli\u003eFunction: Integrated ignition, blower, and safety control\u003c\/li\u003e\n\u003cli\u003eInput: 24 VAC control \/ 120 VAC line\u003c\/li\u003e\n\u003cli\u003eOnboard diagnostic LED fault codes\u003c\/li\u003e\n\u003cli\u003eEquipment: Gas furnace\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThis is a \u003cstrong\u003egenuine Goodman OEM board\u003c\/strong\u003e — it matches the original firmware, relay layout, and connector pinout exactly, so ignition timing and safety lockouts behave as the factory intended. Aftermarket universal boards may require rewiring, jumper reconfiguration, and can void manufacturer coverage. For a control board, OEM is strongly recommended to avoid nuisance faults.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eModerate (3\/5).\u003c\/strong\u003e Replacement involves photographing and transferring wiring harnesses one connector at a time. Always cut power at the breaker before servicing. If you are not comfortable working around 120 VAC and gas-valve wiring, hire a licensed HVAC technician.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eFitment note: confirm the exact part number printed on your existing board before ordering.\u003c\/em\u003e\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058189222259,"sku":"GOODMAN-13160","price":191.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-integrated-furnace-control-board-for-gun100-4b-b1809904s","provider":"National HVAC Parts","version":"1.0","type":"link"}