{"product_id":"icp-control-board-for-wpa3604000rkc1-oem-defrost-circuit-board-ships-today","title":"ICP Control Board for WPA3604000RKC1 — OEM Defrost Circuit Board | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis OEM circuit board (part number 1178001) is the main control board for the ICP\/Tempstar\/Heil WPA3604000RKC1 heat pump. It manages the defrost cycle, sequences the contactor and reversing valve, and coordinates the low-voltage logic that runs the outdoor unit. When the board fails, the heat pump may stop defrosting (causing coil icing), fail to switch between heating and cooling, or shut down entirely with no response to a thermostat call. Installing the correct OEM board restores reliable, factory-spec operation.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\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\u003eDefrost \/ control 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\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eHeat pump outdoor unit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eDirect OEM replacement for the ICP\/Tempstar\/Heil WPA3604000RKC1. Confirm the printed part number 1178001 and the board's terminal layout match your existing board before ordering, as ICP uses several board revisions across its heat pump line.\u003c\/p\u003e\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety First\u003c\/strong\u003e — Disconnect power at the outdoor disconnect and verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the electrical service panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every wire and connector on the board before removing anything.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug the harnesses, release the board standoffs or screws, and lift out the old board.\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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and verify a normal startup, a cooling\/heating call, and a forced or timed defrost cycle.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOutdoor coil ices over because defrost never initiates\u003c\/li\u003e\n\u003cli\u003eUnit will not start or ignores thermostat calls\u003c\/li\u003e\n\u003cli\u003eReversing valve fails to switch between heat and cool\u003c\/li\u003e\n\u003cli\u003eVisible burn marks, swollen capacitors, or corroded traces on the board\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eShipping \u0026amp; Returns\u003c\/h3\u003e\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":63021538673011,"sku":"1178001","price":194.94,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047466058099,"sku":"1178001-GEN","price":149.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-furnace-1178001_bc3eba0e-8395-4386-b73c-0e9a5a46fd38.jpg?v=1782885434","url":"https:\/\/nationalhvacparts.com\/products\/icp-control-board-for-wpa3604000rkc1-oem-defrost-circuit-board-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}