{"product_id":"icp-control-board-for-wpa4424000rkb1-oem-circuit-board-ships-today-1","title":"ICP Control Board for WPA4424000RKB1 — OEM Circuit Board | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis is a genuine OEM control circuit board (part number 1178001) for the ICP\/Tempstar\/Heil model WPA4424000RKB1. The control board is the brain of the outdoor unit — it takes the 24V signal from the thermostat, manages the contactor and fan timing, runs anti-short-cycle and time-delay logic, and on heat-pump units coordinates defrost and reversing-valve operation. Because it is packed with relays, capacitors, and solid-state components, it is vulnerable to power surges, lightning, voltage spikes, and simple age-related failure. A bad board produces frustrating, intermittent symptoms: the unit ignores the thermostat, short-cycles, will not stage properly, or behaves erratically with no obvious mechanical fault. Replacing the board with the exact OEM part restores correct, reliable sequencing.\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\u003e1178001\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eControl \/ Circuit 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\u003eFits Model\u003c\/td\u003e\n\u003ctd\u003eWPA4424000RKB1\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 for the ICP, Tempstar, Heil, and Comfortmaker unit WPA4424000RKB1, and a direct OEM replacement for part 1178001. Match the board's part number and connector layout to your existing board before installing, as control boards are model-specific.\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 disconnect and breaker, then verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the electrical-compartment service panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every plug, harness, and terminal on the board before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug the connectors, release the standoffs or screws, and lift out the failed board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new board on the standoffs and reconnect each harness to its matching terminal per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, call for cooling\/heating, and confirm correct contactor, fan, and (if applicable) defrost sequencing.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eUnit does not respond to the thermostat despite good 24V power.\u003c\/li\u003e\n\u003cli\u003eIntermittent or erratic operation with no mechanical cause.\u003c\/li\u003e\n\u003cli\u003eShort-cycling or failure to honor time-delay logic.\u003c\/li\u003e\n\u003cli\u003eVisible burn marks, scorched traces, or a blown relay 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":63027225919859,"sku":"1178001","price":214.44,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047467073907,"sku":"1178001-GEN","price":164.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-furnace-1178001_883232fa-b57b-4c6f-b925-d82be6db6c8d.jpg?v=1782885476","url":"https:\/\/nationalhvacparts.com\/products\/icp-control-board-for-wpa4424000rkb1-oem-circuit-board-ships-today-1","provider":"National HVAC Parts","version":"1.0","type":"link"}