{"product_id":"tempstar-defrost-control-board-for-t4h524gkd200-oem-1173636-heat-pump-control-ships-today","title":"Tempstar Defrost Control Board for T4H524GKD200 — OEM 1173636 Heat Pump Control | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThe Tempstar defrost control board (OEM part #1173636) governs the defrost cycle on your T4H524GKD200 heat pump. It reads coil temperature and accumulated run time, then initiates and terminates defrost so the outdoor coil sheds frost and ice during heating operation. A failed board can leave the coil iced over, trigger continuous defrost, skip defrost entirely, or mis-time the reversing valve and auxiliary heat handoff. Installing a new defrost board restores correct, efficient defrost control and shields the compressor from damage.\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\u003e1173636\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\u003eTempstar (ICP \/ Heil)\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\u003ctr\u003e\n\u003ctd\u003eFit\u003c\/td\u003e\n\u003ctd\u003eGenuine OEM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eEngineered for the Tempstar T4H524GKD200 heat pump and shared across many ICP-family outdoor units (Tempstar, Heil, Comfortmaker, Arcoaire). Verify the existing board part number before ordering.\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 disconnect and breaker; verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the outdoor unit control\/access panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every wire and connector position before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug low-voltage harnesses and line-voltage terminals, then unscrew the old board from its standoffs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new board, match the defrost timing jumper setting, and reconnect every wire per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, force a defrost cycle, and verify the reversing valve and fan respond correctly.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOutdoor coil freezes solid in heating mode\u003c\/li\u003e\n\u003cli\u003eUnit runs defrost constantly or never defrosts\u003c\/li\u003e\n\u003cli\u003eNo 24V output to reversing valve or fan during defrost\u003c\/li\u003e\n\u003cli\u003eScorched relays, corrosion, or burn 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":"Tempstar","offers":[{"title":"Direct Replacement","offer_id":63021782565235,"sku":"1173636-GEN","price":129.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048446542195,"sku":"1173636","price":167.7,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-defrost-1173636_6878c985-80a3-48f5-88c2-86c5bacc3303.jpg?v=1782959899","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-defrost-control-board-for-t4h524gkd200-oem-1173636-heat-pump-control-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}