{"product_id":"icp-integrated-furnace-control-board-for-rgs300heaa0aaaa-ships-today","title":"ICP Integrated Furnace Control Board for RGS300HEAA0AAAA — Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis OEM Integrated Furnace Control (IFC) board, ICP part number 1183618, is the central electronic brain of your RGS300HEAA0AAAA gas furnace. It manages the complete heating sequence — inducer start-up, hot surface igniter timing, gas valve actuation, blower delays, and continuous flame and pressure-switch safety monitoring. Operating on a 24V control circuit, the board interprets thermostat calls and orchestrates every component in the correct order. When a control board fails, the furnace may not respond to the thermostat at all, may lock out after a few ignition attempts, run the blower constantly, or short-cycle without producing steady heat. A flashing diagnostic LED on the board, no inducer operation, or a furnace that powers up but never ignites are classic signs the control has failed.\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\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\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eIgnition, gas valve, blower \u0026amp; inducer control with safety lockout\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\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eDesigned as a direct OEM replacement for the ICP\/Tempstar\/Heil RGS300HEAA0AAAA gas furnace and the broader RGS300 family. ICP manufactures under several brand names (Tempstar, Heil, Comfortmaker, Arcoaire), so this board services equivalent units across those lines. Always confirm the part number printed on your existing board matches 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 with a multimeter before touching any wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the furnace service\/blower panel to expose the control board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every wire and connector position before disconnecting anything.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug the molded harness connectors, release the board mounting standoffs or screws, and lift out the old control.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Seat the new board on the standoffs, reconnect each harness per your photo, and ensure connectors click fully home.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, send a heat call from the thermostat, and confirm the full ignition sequence and blower operation while watching the diagnostic LED.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFurnace does not respond to thermostat heat calls.\u003c\/li\u003e\n\u003cli\u003eIgnition lockout or diagnostic LED flashing a fault code.\u003c\/li\u003e\n\u003cli\u003eBlower runs continuously or never starts.\u003c\/li\u003e\n\u003cli\u003eInducer or gas valve fails to energize in sequence.\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":63027282674035,"sku":"1183618","price":188.5,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047702020467,"sku":"1183618-GEN","price":145.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-furnace-1183618_58584c4b-7528-4897-b9b3-07bcc8735313.jpg?v=1782894884","url":"https:\/\/nationalhvacparts.com\/products\/icp-integrated-furnace-control-board-for-rgs300heaa0aaaa-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}