{"product_id":"icp-integrated-furnace-control-board-kit-for-rgs121hscb0aaa-oem-ships-today","title":"ICP Integrated Furnace Control Board Kit for RGS121HSCB0AAA — OEM | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis genuine OEM control board kit (part #1183618) is the integrated furnace control (IFC) brain of the ICP\/Tempstar\/Heil RGS121HSCB0AAA furnace. It sequences the entire heating cycle — energizing the inducer, proving the pressure switch, firing the hot surface igniter, opening the gas valve, monitoring flame, and timing the blower on and off. It also runs continuous safety logic and flashes diagnostic fault codes. When the board fails, symptoms range from no response at all to intermittent lockouts, blower that won't shut off, or erratic ignition. This kit includes the board and mounting hardware needed for a direct OEM replacement.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpec\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e1183618\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eIntegrated Furnace Control Board Kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eICP \/ Tempstar \/ Heil\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFits Model\u003c\/td\u003e\n\u003ctd\u003eRGS121HSCB0AAA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eIgnition, blower, inducer \u0026amp; safety timing control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiagnostics\u003c\/td\u003e\n\u003ctd\u003eLED fault-code indication\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eBuilt for the ICP-family RGS121HSCB0AAA and related Tempstar, Heil, and Comfortmaker furnaces using this integrated control. Because boards are revision-specific, verify part #1183618 against your existing board and unit parts list before ordering.\u003c\/p\u003e\n\n\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety First\u003c\/strong\u003e — Disconnect power to the furnace. Verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the furnace control\/blower compartment panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every wire and connector on the old board; note plug locations carefully.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug all harnesses, remove the mounting screws, and lift out the old board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new board and transfer each connector to the identical terminal per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, run a full heat cycle, and confirm proper ignition, blower timing, and no fault codes.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFurnace completely unresponsive on a heat call\u003c\/li\u003e\n\u003cli\u003eRepeated lockouts or erratic ignition sequencing\u003c\/li\u003e\n\u003cli\u003eBlower runs constantly or fails to start\u003c\/li\u003e\n\u003cli\u003eVisible burnt traces, scorched relays, or no LED activity\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eShipping \u0026amp; Returns\u003c\/h3\u003e\n\u003cp\u003eShips same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.\u003c\/p\u003e","brand":"ICP","offers":[{"title":"OEM","offer_id":63027510313331,"sku":"1183618","price":245.7,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047702511987,"sku":"1183618-GEN","price":189.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-furnace-1183618_79fda23b-9ef2-4877-a7d0-fcd70ec13c8f.jpg?v=1782894918","url":"https:\/\/nationalhvacparts.com\/products\/icp-integrated-furnace-control-board-kit-for-rgs121hscb0aaa-oem-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}