{"product_id":"icp-control-board-for-wpa3424000rkc1-defrost-circuit-board-ships-today-1","title":"ICP Control Board for WPA3424000RKC1 — Defrost Circuit Board | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis OEM circuit board (part \u003cstrong\u003e1178001\u003c\/strong\u003e) is the brain of the ICP \/ Tempstar \/ Heil \u003cstrong\u003eWPA3424000RKC1\u003c\/strong\u003e heat pump. It manages the defrost cycle, sequences the compressor contactor and reversing valve, monitors the defrost thermostat, and protects the system with built-in timing delays. When the board fails the unit may stop heating, ice over in heat-pump mode, short-cycle, or fail to start the compressor entirely. A board with burnt traces, a cracked relay, or no output to the contactor is a classic failure. Replacing it restores correct defrost timing and reliable compressor control.\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\u003eOEM Part 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\u003eDefrost \/ circuit 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\u003eDefrost timing, compressor \u0026amp; reversing-valve sequencing\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-fit replacement for the ICP \/ Tempstar \/ Heil \/ Comfortmaker \u003cstrong\u003eWPA3424000RKC1\u003c\/strong\u003e condenser. This board is shared across many ICP-family heat-pump outdoor units; verify the existing part number 1178001 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 outdoor disconnect, then verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the control-panel service cover on the condenser.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the full wiring harness and every plug location before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug the low-voltage connectors and high-voltage leads, then unscrew the old board from its standoffs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new board, then reconnect each connector and lead exactly per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, confirm the contactor energizes, and force a defrost cycle to verify operation.\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 and never defrosts\u003c\/li\u003e\n\u003cli\u003eCompressor will not start or short-cycles\u003c\/li\u003e\n\u003cli\u003eVisible burnt traces, swollen capacitors, or cracked relay on the board\u003c\/li\u003e\n\u003cli\u003eNo 24V output to the contactor coil despite a thermostat call\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":63027227591027,"sku":"1178001","price":214.5,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047465599347,"sku":"1178001-GEN","price":165.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-furnace-1178001_56094e4e-2bce-411e-9e3f-7d1560f0d606.jpg?v=1782885427","url":"https:\/\/nationalhvacparts.com\/products\/icp-control-board-for-wpa3424000rkc1-defrost-circuit-board-ships-today-1","provider":"National HVAC Parts","version":"1.0","type":"link"}