{"product_id":"icp-furnace-control-board-kit-for-rgs121hecb0aaa-integrated-ignition-control-ships-today","title":"ICP Furnace Control Board Kit for RGS121HECB0AAA — Integrated Ignition Control | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis OEM control board kit (part 1183618) is the integrated furnace control (IFC) for the ICP Tempstar \/ Heil RGS121HECB0AAA gas furnace. The board is the brain of the furnace — it sequences the inducer, hot surface igniter, gas valve, and blower; manages safety lockouts from the limit and pressure switches; and stores diagnostic flash codes on its onboard LED. A failed board typically presents as a completely dead furnace, an inducer that runs but never advances to ignition, a blower that won't energize, or an LED flashing a hard-lockout fault. Because intermittent board failures mimic igniter, pressure-switch, and gas-valve problems, replacing the IFC is a common final step after those components test good.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\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\u003eRGS121HECB0AAA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl Voltage\u003c\/td\u003e\n\u003ctd\u003e24V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiagnostics\u003c\/td\u003e\n\u003ctd\u003eOnboard LED flash codes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eDirect replacement for the ICP RGS121HECB0AAA gas furnace and shared Tempstar, Heil, Comfortmaker, and Day \u0026amp; Night models using the same control platform. Match the OEM number on your existing board before ordering.\u003c\/p\u003e\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety First\u003c\/strong\u003e — Disconnect power at the furnace switch and breaker. Verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the blower-compartment service panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every wire and connector position before disconnecting — terminal layout is critical.\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, transfer the wiring exactly per your photo, and set any jumper\/dip configuration to match.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and run a full heat cycle; confirm normal sequencing and a steady status LED.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFurnace completely unresponsive with 24V and line power present\u003c\/li\u003e\n\u003cli\u003eInducer runs but igniter and gas valve never energize\u003c\/li\u003e\n\u003cli\u003eBlower fails to start or runs continuously\u003c\/li\u003e\n\u003cli\u003eStatus LED dark or flashing a hard-lockout\/internal fault code\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eShipping \u0026amp; Returns\u003c\/h3\u003e\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":63027533218163,"sku":"1183618","price":246.94,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047555023219,"sku":"1183618-GEN","price":189.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-furnace-1183618_8adeecc5-1650-418b-95f2-1273ca40296a.jpg?v=1782889081","url":"https:\/\/nationalhvacparts.com\/products\/icp-furnace-control-board-kit-for-rgs121hecb0aaa-integrated-ignition-control-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}