{"product_id":"icp-control-board-for-wph4364000rka1-oem-circuit-board-ships-today","title":"ICP Control Board for WPH4364000RKA1 — OEM Circuit Board | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis is the genuine OEM control board \/ circuit board (P\/N 1178001) for the ICP\/Tempstar\/Heil WPH4364000RKA1 packaged heat pump. The control board is the brain of the unit — it manages the operating sequence, processes thermostat inputs, controls compressor and fan timing, sequences defrost on the heat pump, and provides safety interlocks and fault diagnostics. When the board fails, the symptoms can mimic almost any other component: no response to thermostat calls, erratic operation, missing defrost cycles, or blank\/blinking diagnostic LEDs. Replacing the board with the correct OEM part restores reliable, code-compliant control of the system.\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\u003eIntegrated 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\u003eApplication\u003c\/td\u003e\n\u003ctd\u003ePackaged Heat Pump (WPH4364000RKA1)\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\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eDirect factory replacement for the ICP\/Tempstar\/Heil WPH4364000RKA1 packaged heat pump and related ICP-family units that originally shipped with control board 1178001. Match the board's part number and connector layout to your existing board 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 disconnect, then verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the electrical control-box panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every connector and wire position on the board before disconnecting anything.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug the harness connectors, release the board standoffs\/screws, and lift out the old board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new board, reconnect every harness exactly per your photo, and set any jumpers\/DIP switches to match.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, run a cooling, heating, and defrost call, and confirm normal operation with no fault codes.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eUnit completely unresponsive to thermostat calls.\u003c\/li\u003e\n\u003cli\u003eErratic operation, random cycling, or missing defrost.\u003c\/li\u003e\n\u003cli\u003eBlank or rapidly blinking diagnostic LED \/ fault codes.\u003c\/li\u003e\n\u003cli\u003eVisible burn marks, corrosion, or scorched relays 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":63021485949299,"sku":"WPH4364000RKA1","price":245.7,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047469007219,"sku":"WPH4364000RKA1-GEN","price":189.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-furnace-WPH4364000RKA1.jpg?v=1782885559","url":"https:\/\/nationalhvacparts.com\/products\/icp-control-board-for-wph4364000rka1-oem-circuit-board-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}