{"product_id":"icp-control-board-for-wph4244000rkb1-defrost-circuit-board-ships-today","title":"ICP Control Board for WPH4244000RKB1 — Defrost Circuit Board | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis OEM circuit board (part #1178001) is the brain of the outdoor unit on the ICP\/Tempstar\/Heil WPH4244000RKB1 heat pump. It manages the defrost cycle, sequences the compressor contactor and reversing valve, monitors the defrost thermostat and timing, and protects the system through anti-short-cycle and time-delay logic. When the board fails, the heat pump can lose defrost entirely (causing the outdoor coil to ice over in heating), fail to switch between heating and cooling, or stop energizing the compressor altogether. Board faults often masquerade as compressor or sensor problems, so confirming board operation is a key diagnostic step.\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 \/ 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\u003e24 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFunctions\u003c\/td\u003e\n\u003ctd\u003eDefrost Timing, Reversing-Valve \u0026amp; Contactor Sequencing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eOutdoor Heat-Pump Control\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 OEM fit for the ICP\/Tempstar\/Heil WPH4244000RKB1 heat pump. Match the part number and connector layout to your existing board, as ICP-family defrost boards vary by platform and timing configuration.\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. Verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the control-compartment service panel on the condensing unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every connector, plug, and wire landing on the old board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug each harness, release the board standoffs\/screws, and lift the board out.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Seat the new board on the standoffs and reconnect each harness exactly per your photo; set any defrost-timing jumper to match.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, run a heating and cooling call, and verify defrost initiation\/termination and proper valve switching.\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 goes into defrost\u003c\/li\u003e\n\u003cli\u003eHeat pump won't switch between heating and cooling\u003c\/li\u003e\n\u003cli\u003eCompressor or fan won't energize despite a valid call\u003c\/li\u003e\n\u003cli\u003eVisible scorching, burnt relays, or corroded traces 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":63021489946995,"sku":"WPH4244000RKB1","price":214.44,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047468646771,"sku":"WPH4244000RKB1-GEN","price":164.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-furnace-WPH4244000RKB1.jpg?v=1782885543","url":"https:\/\/nationalhvacparts.com\/products\/icp-control-board-for-wph4244000rkb1-defrost-circuit-board-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}