{"product_id":"icp-defrost-control-circuit-board-for-wph3424000rkc1-oem-ships-today-1","title":"ICP Defrost Control Circuit Board for WPH3424000RKC1 — OEM | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis is the genuine OEM control circuit board (Part No. 1178001) for the ICP\/Tempstar\/Heil WPH3424000RKC1 heat pump. The board is the brain of the outdoor unit — on a heat pump it manages the defrost cycle, monitors the coil temperature sensor, sequences the reversing valve and auxiliary heat, and controls the compressor contactor and outdoor fan timing. A failed control board can cause a no-defrost condition with ice buildup on the outdoor coil, a unit that won't start, erratic mode switching, or a compressor that short-cycles. Because the board coordinates safety timers and defrost logic, a faulty board often shows up as poor heating performance in cold weather.\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\u003eHeat-Pump Defrost 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\u003e24 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eOEM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eBuilt as the factory replacement control board for the ICP\/Tempstar\/Heil WPH3424000RKC1 heat pump condensing unit. Control boards are model-specific — confirm the exact part number on your existing board and the connector layout 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 disconnect and breaker, then verify zero voltage with a multimeter before handling the board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the condensing unit control-panel cover.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every plug, sensor, and wire on the old board before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug the connectors, release the board standoffs or mounting screws, and lift the old board out.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Seat the new board on its standoffs and reconnect every harness exactly per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, run a heating and cooling call, and force a defrost test to confirm correct sequencing.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOutdoor coil ices over with no defrost cycle.\u003c\/li\u003e\n\u003cli\u003eUnit won't start or randomly short-cycles.\u003c\/li\u003e\n\u003cli\u003eReversing valve or fan timing behaves erratically.\u003c\/li\u003e\n\u003cli\u003eVisible burnt traces, relays, or scorch marks 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":63027204915571,"sku":"1178001","price":220.94,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047507804531,"sku":"1178001-GEN","price":169.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-furnace-1178001_14d95659-6e6a-4373-b4e8-61609438ce60.jpg?v=1782887419","url":"https:\/\/nationalhvacparts.com\/products\/icp-defrost-control-circuit-board-for-wph3424000rkc1-oem-ships-today-1","provider":"National HVAC Parts","version":"1.0","type":"link"}