{"product_id":"icp-furnace-control-board-for-rgs121seca0aaa-oem-integrated-ignition-control-ships-today","title":"ICP Furnace Control Board for RGS121SECA0AAA — OEM Integrated Ignition Control | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis OEM integrated furnace control board (kit part number 1183618) is the brain of the ICP\/Heil\/Tempstar RGS121SECA0AAA gas furnace. It manages the complete heating sequence — igniter warm-up, gas valve timing, inducer and blower operation, and all 24V safety circuits including limit and pressure switches. When this board fails, the furnace typically will not start, locks out after a few ignition attempts, or runs the blower continuously. The board includes onboard diagnostic LED flash codes that help technicians pinpoint faults quickly.\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 (KIT CONTROL BOARD)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eIntegrated Furnace Ignition Control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eICP \/ Heil \/ Tempstar \/ Comfortmaker\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\u003eFits Model\u003c\/td\u003e\n\u003ctd\u003eRGS121SECA0AAA\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\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eDesigned as the OEM replacement for the ICP\/Heil\/Tempstar RGS121SECA0AAA gas furnace and the broader RGS121 family that share this control assembly. Always confirm your existing board part number and connector layout against 1183618 before installing.\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, then verify zero voltage at the board with a multimeter. Shut off the gas supply.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the furnace blower-compartment service panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every wire harness and connector position before disconnecting anything.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug all connectors, remove the board mounting screws\/standoffs, and lift out the failed control board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new 1183618 board, reconnect every harness exactly per your photos, and set any DIP\/jumper settings to match the original.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore gas and power, call for heat, and confirm a full ignition cycle with proper blower operation 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 fails to ignite or repeatedly locks out after ignition attempts\u003c\/li\u003e\n\u003cli\u003eBlower runs constantly or never engages\u003c\/li\u003e\n\u003cli\u003eVisible burn marks, corrosion, or cracked traces on the board\u003c\/li\u003e\n\u003cli\u003eErratic operation or diagnostic LED showing a control\/internal fault\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eShipping \u0026amp; Returns\u003c\/h3\u003e\n\u003cp\u003eShips same day on orders placed 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":63027461259635,"sku":"1183618","price":219.7,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047523959155,"sku":"1183618-GEN","price":169.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-furnace-1183618_786e35d4-d9b2-47ec-a8a6-3a3b6af6d53b.jpg?v=1782888125","url":"https:\/\/nationalhvacparts.com\/products\/icp-furnace-control-board-for-rgs121seca0aaa-oem-integrated-ignition-control-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}