{"product_id":"icp-fan-coil-control-board-for-wahm422a1-oem-replacement-ships-today","title":"ICP Fan Coil Control Board for WAHM422A1 — OEM Replacement | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis OEM fan coil control board (part number 1172975) is the central logic board for your ICP WAHM422A1 air handler. It manages blower timing and speed, interprets thermostat calls, sequences the electric heat strips, and monitors safety inputs. When the board fails, symptoms range from a completely dead air handler to a blower that runs constantly, won't respond to the thermostat, or won't engage auxiliary heat. Power surges, lightning, loose connections arcing at the terminals, and failed relays are the usual causes.\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\u003e1172975\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eFan Coil \/ Air Handler Control Board\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eICP (Tempstar \/ Heil \/ Comfortmaker)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eBlower control, thermostat interface, heat sequencing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFits Model\u003c\/td\u003e\n\u003ctd\u003eWAHM422A1\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 OEM replacement for the ICP WAHM422A1 fan coil air handler and matching Tempstar, Heil, and Comfortmaker variants that use the same board. Match the part number and connector layout to 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 breaker and verify zero voltage with a multimeter before touching the board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the air handler control-compartment service panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every wire harness, plug, and terminal connection on the board before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug all connectors, release the mounting standoffs or screws, and lift the failed board out.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Seat the new board on its standoffs and reconnect each harness exactly per your photo, confirming every plug is fully latched.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and verify the blower responds correctly to fan, cool, and heat calls.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAir handler is completely dead with confirmed line and 24V power\u003c\/li\u003e\n\u003cli\u003eBlower runs continuously and ignores the thermostat\u003c\/li\u003e\n\u003cli\u003eElectric heat strips fail to energize on a heat call\u003c\/li\u003e\n\u003cli\u003eVisible scorching, burnt relays, or a burnt smell on the board\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":63021618102643,"sku":"1172975","price":240.44,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047520813427,"sku":"1172975-GEN","price":184.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-furnace-1172975_39fa6218-124d-4e98-ba4b-999eb22c4a36.jpg?v=1782887927","url":"https:\/\/nationalhvacparts.com\/products\/icp-fan-coil-control-board-for-wahm422a1-oem-replacement-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}