{"product_id":"icp-fan-coil-control-board-for-wahm424a1-oem-air-handler-board-ships-today","title":"ICP Fan Coil Control Board for WAHM424A1 — OEM Air Handler Board | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis is a genuine OEM fan coil control board (part number 1172975) for the ICP \/ Tempstar \/ Heil WAHM424A1 air handler. The control board is the brain of the fan coil — it receives 24V thermostat calls, sequences the blower motor, manages the electric heat relays and time delays, and coordinates the low-voltage safety circuit. When the board fails, the system may not respond to thermostat calls, the blower may run continuously or not at all, electric heat staging may misbehave, or the unit may show no operation despite a healthy transformer and motor. Power surges, lightning, and failed relays or solder joints are the most common causes of board failure.\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)\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\u003eBlower sequencing, relay \u0026amp; heat staging control\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\u003eDirect OEM replacement for the ICP WAHM424A1 fan coil air handler. It also fits the broader WAHM424 series and other ICP\/Tempstar\/Heil\/Comfortmaker fan coil units originally equipped with the 1172975 control board. Verify the part number printed on your existing board before ordering.\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 servicing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the air handler service panel to expose the control box.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every wire and terminal connection on the existing board before disconnecting anything.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Label and disconnect the low-voltage and line-voltage leads, then unscrew the board from its standoffs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new board on the standoffs and reconnect every wire to the matching terminal per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and run a thermostat call to confirm correct blower operation, heat staging, and relay sequencing.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSystem does not respond to thermostat calls despite good power and transformer\u003c\/li\u003e\n\u003cli\u003eBlower runs continuously or will not start at all\u003c\/li\u003e\n\u003cli\u003eElectric heat stages erratically or fails to energize\u003c\/li\u003e\n\u003cli\u003eVisible scorch marks, burnt relays, or a burnt-electronics odor 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":63021618004339,"sku":"1172975","price":188.44,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047520846195,"sku":"1172975-GEN","price":144.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-furnace-1172975_99596223-d73c-4c8a-9f18-88dbb3abae8f.jpg?v=1782887929","url":"https:\/\/nationalhvacparts.com\/products\/icp-fan-coil-control-board-for-wahm424a1-oem-air-handler-board-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}