{"product_id":"icp-integrated-furnace-control-board-for-rgs121heca0aaa-oem-kit-1183618-ships-today","title":"ICP Integrated Furnace Control Board for RGS121HECA0AAA — OEM Kit 1183618 | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis is a genuine OEM integrated furnace control board kit (part number 1183618, KIT CONTROL BOARD) for the ICP \/ Tempstar \/ Heil RGS121HECA0AAA gas furnace. The control board is the brain of the furnace: it sequences the inducer, hot surface igniter, gas valve, and blower, monitors the pressure switch and limit safeties, and flashes diagnostic fault codes through its onboard LED. Supplied as a complete kit with the mounting hardware and instructions needed for a clean swap. When a furnace behaves erratically — no response to a heat call, blower running constantly, or repeated lockouts with no obvious mechanical cause — a failed control board is a frequent culprit.\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\u003eOEM Part Number\u003c\/td\u003e\n\u003ctd\u003e1183618 (Kit, Control Board)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eIntegrated Furnace Control Board\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eICP \/ Tempstar \/ Heil \/ Comfortmaker\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFits Model\u003c\/td\u003e\n\u003ctd\u003eRGS121HECA0AAA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFunctions\u003c\/td\u003e\n\u003ctd\u003eIgnition sequencing, blower timing, safety monitoring, diagnostics\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eDirect OEM replacement kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eDirect-fit replacement for the ICP RGS121HECA0AAA gas furnace and related Tempstar, Heil, and Comfortmaker models specifying kit 1183618. Verify the part number printed on your existing board before ordering, as control boards are model-specific.\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 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 control-compartment service panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every wire and terminal on the old board before disconnecting anything.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Label and unplug each harness, 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 on the supplied standoffs and reconnect every harness exactly per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, call for heat, and confirm a full clean cycle. Read the diagnostic LED to verify no fault codes remain.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNo response to a thermostat heat call despite power present.\u003c\/li\u003e\n\u003cli\u003eBlower runs continuously or fails to start.\u003c\/li\u003e\n\u003cli\u003eRepeated, unexplained ignition lockouts.\u003c\/li\u003e\n\u003cli\u003eBurned, scorched, or corroded traces, relays, or connectors on the board.\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":63027534135667,"sku":"1183618","price":223.6,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047701823859,"sku":"1183618-GEN","price":172.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-furnace-1183618_876a2ead-15fc-4284-8fc9-004728f62f20.jpg?v=1782894870","url":"https:\/\/nationalhvacparts.com\/products\/icp-integrated-furnace-control-board-for-rgs121heca0aaa-oem-kit-1183618-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}