{"product_id":"icp-defrost-control-board-for-yk042g-heat-pump-ships-today-1","title":"ICP Defrost Control Board for YK042G — Heat Pump | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis OEM defrost control board (part 34332101) is the brain of the defrost cycle on the ICP \/ Tempstar \/ Heil YK042G heat pump. It monitors coil temperature and run time, then commands the unit into defrost to clear frost and ice from the outdoor coil during heating season — energizing the reversing valve, pausing the outdoor fan, and timing the cycle. A failed defrost board leaves the outdoor coil to ice over, killing heating capacity, or sends the unit into endless defrost. Common failure symptoms include the outdoor unit caked in ice, no heat in cold weather, the reversing valve not shifting on schedule, blown low-voltage fuses, or no response at all from the 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\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e34332101\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eDefrost Control Board\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eICP (Tempstar \/ Heil \/ Comfortmaker)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eDefrost timing, reversing valve \u0026amp; fan control\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\u003eFit\u003c\/td\u003e\n\u003ctd\u003eOEM Replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eHeat Pump\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 replacement for the ICP \/ Tempstar \/ Heil YK042G heat pump. Defrost boards are model-specific — always match the printed part number (34332101) and connector layout on your existing board 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 disconnect and breaker, then verify zero voltage with a multimeter before touching the board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the condensing unit service panel to expose the control box.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every harness plug, sensor lead, and jumper\/dip-switch setting before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug each connector, remove the defrost sensor lead, and unscrew the board from its standoffs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new board, match any timing jumper settings, and reconnect each plug per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, run a heating call, and verify a proper timed defrost cycle and changeover.\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 freezes over and heating capacity drops\u003c\/li\u003e\n\u003cli\u003eUnit stuck in continuous defrost or never enters defrost\u003c\/li\u003e\n\u003cli\u003eReversing valve fails to shift on the defrost cycle\u003c\/li\u003e\n\u003cli\u003eNo response from the control or repeated blown low-voltage fuses\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":63027187876211,"sku":"34332101","price":188.5,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047505936755,"sku":"34332101-GEN","price":145.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-defrost-34332101_22444480-af4c-4062-88ec-5c326616fbed.jpg?v=1782887329","url":"https:\/\/nationalhvacparts.com\/products\/icp-defrost-control-board-for-yk042g-heat-pump-ships-today-1","provider":"National HVAC Parts","version":"1.0","type":"link"}