{"product_id":"icp-control-circuit-board-for-wph3364000rkc1-defrost-sequencing-ships-today-1","title":"ICP Control Circuit Board for WPH3364000RKC1 — Defrost \u0026 Sequencing | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis OEM control circuit board is the electronic brain of your ICP\/Tempstar\/Heil WPH3364000RKC1 heat pump. It manages the defrost cycle, sequences the compressor and reversing valve, processes 24V thermostat inputs, and protects the system through built-in time delays. When the board fails, symptoms range from a unit that won't run at all, to a heat pump that ices over because it never enters defrost, to erratic switching between heating and cooling. Voltage spikes, moisture, and burnt relays on the board are the usual culprits behind these intermittent, hard-to-diagnose faults.\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\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 \/ 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\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eDefrost, sequencing, time-delay protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eOEM Replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eBuilt for the ICP WPH3364000RKC1 heat pump and compatible with related Tempstar, Heil, and Comfortmaker models that use the same control board. Match the OEM part number 1178001 and connector layout before installing.\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 breaker and verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the control-panel service cover.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every harness plug and terminal connection before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug all connectors and unclip or unscrew the failed board from its standoffs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Seat the new board on the standoffs and reconnect every harness per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and verify normal startup, sequencing, and a forced defrost cycle.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eHeat pump won't start or randomly shuts down\u003c\/li\u003e\n\u003cli\u003eOutdoor coil ices over because defrost never initiates\u003c\/li\u003e\n\u003cli\u003eErratic switching between heating and cooling modes\u003c\/li\u003e\n\u003cli\u003eVisible burnt relays or scorch marks 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":63027205079411,"sku":"1178001","price":194.94,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047487390067,"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_42aa58a3-738d-4d52-a0c0-042e6163b0d6.jpg?v=1782886228","url":"https:\/\/nationalhvacparts.com\/products\/icp-control-circuit-board-for-wph3364000rkc1-defrost-sequencing-ships-today-1","provider":"National HVAC Parts","version":"1.0","type":"link"}