{"product_id":"icp-furnace-control-board-kit-for-rgs300ldaa0aaaa-oem-part-1183618-ships-today","title":"ICP Furnace Control Board Kit for RGS300LDAA0AAAA — OEM Part 1183618 | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis genuine OEM control board kit (part number 1183618) is the electronic brain of the ICP \/ Heil \/ Tempstar RGS300LDAA0AAAA gas furnace. It manages the entire heating sequence — reading the thermostat call, energizing the inducer, proving the pressure switch, firing the igniter, opening the gas valve, monitoring flame, and staging the blower on and off. It also runs the safety logic and reports fault codes via its diagnostic LED. When the board fails, the furnace may be completely dead, ignite erratically, blow cold air, or flash error codes that point nowhere. Replacing it with the correct OEM kit restores proper sequencing, safety supervision, and reliable heat.\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\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDescription\u003c\/td\u003e\n\u003ctd\u003eControl Board Kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eIntegrated Furnace Control (IFC)\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\u003eFits Model\u003c\/td\u003e\n\u003ctd\u003eRGS300LDAA0AAAA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eGenuine 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 kit for the ICP\/Heil\/Tempstar RGS300LDAA0AAAA gas furnace and shared platform models specifying OEM part 1183618. Confirm the part number on your existing board 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 with a multimeter before touching the board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the furnace control\/blower panel to expose the existing control board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every connector, harness, and terminal position before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug the harnesses one at a time, release the mounting standoffs\/screws, and lift out the old board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new board, transfer each connector to its matching terminal per your photo, and confirm dip-switch\/jumper settings match the original.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, run a full heat cycle, and verify the diagnostic LED shows normal operation with 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 is completely unresponsive to a thermostat call.\u003c\/li\u003e\n\u003cli\u003eDiagnostic LED flashing inconsistent or unresolvable fault codes.\u003c\/li\u003e\n\u003cli\u003eBlower or inducer runs continuously, or won't run at all.\u003c\/li\u003e\n\u003cli\u003eVisible burnt traces, scorched relays, or a melted connector 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":63027280413043,"sku":"1183618","price":246.94,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047568523635,"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_86dfd5c8-42cb-4609-b747-1487b68fcae9.jpg?v=1782889615","url":"https:\/\/nationalhvacparts.com\/products\/icp-furnace-control-board-kit-for-rgs300ldaa0aaaa-oem-part-1183618-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}