{"product_id":"icp-furnace-control-board-for-rgs300hdfa0aaaa-oem-kit-1183618-ships-today","title":"ICP Furnace Control Board for RGS300HDFA0AAAA — OEM Kit 1183618 | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThe OEM Control Board Kit (part #1183618) is the integrated furnace control (IFC) that manages the complete heating sequence for your ICP Tempstar Heil RGS300HDFA0AAAA gas furnace. This board orchestrates ignition timing, gas valve operation, blower control, and flame sensing, while running continuous self-diagnostics and flashing fault codes through its onboard LED. When the control board fails, the furnace loses its 'brain' — even when every other component is healthy. Common failure symptoms include no response from the thermostat, the furnace failing to ignite, the inducer or blower running continuously, intermittent lockouts, or burned\/corroded relay contacts on the board itself. Power surges, overheating, moisture intrusion, and aged relays are the usual culprits. This is a factory OEM kit, so it ships with the correct firmware and connector layout for a true plug-and-play replacement.\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\u003eControl Voltage\u003c\/td\u003e\n\u003ctd\u003e24V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eOEM Direct Replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiagnostics\u003c\/td\u003e\n\u003ctd\u003eLED fault-code indicator\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eEngineered as a direct-fit replacement for the ICP Tempstar Heil RGS300HDFA0AAAA gas furnace. ICP-built equipment is sold under multiple brands — Comfortmaker, Arcoaire, KeepRite, and Day \u0026amp; Night — so this board fits many cross-branded units sharing the same chassis. Always verify the printed part 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 service switch and breaker, then verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the furnace control-compartment service panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every wire harness and connector position before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug all low- and line-voltage connectors, release the mounting screws\/standoffs, 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 per your photos.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, call for heat, and confirm a full ignition cycle with no fault codes.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFurnace is completely unresponsive to thermostat calls\u003c\/li\u003e\n\u003cli\u003eBlower or inducer motor runs nonstop or won't start\u003c\/li\u003e\n\u003cli\u003eRepeated ignition lockouts or erratic LED fault codes\u003c\/li\u003e\n\u003cli\u003eVisible burn marks, corrosion, or swollen relays on the board\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":63027282805107,"sku":"1183618","price":206.7,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047527367027,"sku":"1183618-GEN","price":159.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-furnace-1183618_7500ef66-ac01-4d5a-8f0c-93944f131680.jpg?v=1782888273","url":"https:\/\/nationalhvacparts.com\/products\/icp-furnace-control-board-for-rgs300hdfa0aaaa-oem-kit-1183618-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}