{"product_id":"icp-control-board-kit-for-rgs121hfca0aaa-gas-furnace-integrated-furnace-control-ships-today","title":"ICP Control Board Kit for RGS121HFCA0AAA Gas Furnace — Integrated Furnace Control | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis OEM Integrated Furnace Control (IFC) board kit, part number 1183618, is the central brain of your ICP Tempstar\/Heil RGS121HFCA0AAA gas furnace. It manages the entire heating sequence — igniter timing, gas valve operation, inducer and blower motor control, flame sensing, and safety lockouts. The board interprets thermostat calls and orchestrates each component in the correct order while continuously monitoring limit and pressure switches. When this board fails, the furnace may fail to ignite, short-cycle, lock out on flashing diagnostic LEDs, or run the blower continuously. This direct-replacement kit restores reliable, code-compliant operation.\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 Control Board\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\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\u003eRGS121HFCA0AAA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFit\u003c\/td\u003e\n\u003ctd\u003eOEM Direct Replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eEngineered specifically for the ICP\/Tempstar\/Heil RGS121HFCA0AAA gas furnace and closely related RGS121 series units that call out part 1183618. Always confirm the part number printed on your existing board before ordering to guarantee an exact fit.\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, shut off the gas, and verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the lower blower-compartment service panel to expose the control board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every wire harness and connector before disconnecting anything.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug all low- and line-voltage connectors, release the board's mounting tabs\/screws, and lift out the old board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new board, then reconnect each harness exactly as photographed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore gas and power, run a full heat cycle, and confirm proper igniter, gas valve, and blower sequencing with no diagnostic faults.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFurnace will not start or igniter never energizes on a heat call\u003c\/li\u003e\n\u003cli\u003eRepeated lockouts or flashing error codes on the board's diagnostic LED\u003c\/li\u003e\n\u003cli\u003eBlower runs constantly or fails to start\u003c\/li\u003e\n\u003cli\u003eVisible burn marks, corrosion, or cracked solder joints 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":63027526631795,"sku":"1183618","price":245.7,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047472152947,"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_918b2f65-5805-4a96-8b04-afddf9b22fb4.jpg?v=1782885649","url":"https:\/\/nationalhvacparts.com\/products\/icp-control-board-kit-for-rgs121hfca0aaa-gas-furnace-integrated-furnace-control-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}