{"product_id":"tempstar-defrost-control-board-for-t4h736gkd200-heat-pump-defrost-ships-today","title":"Tempstar Defrost Control Board for T4H736GKD200 — Heat Pump Defrost | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis is a genuine OEM defrost control board (part number 1173636) for the Tempstar T4H736GKD200 heat pump. In heating mode the outdoor coil collects frost, and the defrost board monitors coil temperature and run time to decide when to run a defrost cycle. When it initiates defrost it energizes the reversing valve, stops the outdoor fan, and briefly runs the unit in cooling mode to melt ice off the coil, then returns to heating. A failed defrost board causes a heat pump that ices over and loses heating capacity, never defrosts, defrosts too often, or fails to control the outdoor fan and reversing valve correctly. Because the board ties together the fan, reversing valve, and timing logic, a fault here can mimic several other failures, so verifying the board is a common diagnostic step. The correct OEM board restores proper defrost timing and protects the coil and compressor.\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\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\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 Timing \/ Reversing Valve \u0026amp; Fan Control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFits Model\u003c\/td\u003e\n\u003ctd\u003eT4H736GKD200\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eFactory-spec for the Tempstar T4H736GKD200 heat pump and shared ICP \/ Heil heat pump platforms using the same defrost board and sensor harness. Match the OEM part number and connector layout 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, then verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the condenser control-box service panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every connector and the defrost sensor location before unplugging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug the harness connectors and unscrew or unclip the old board from its standoffs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new board, reconnect each harness and the defrost sensor exactly per your photo, and set any jumpers to match.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, force or observe a defrost cycle, and confirm correct fan, reversing valve, and timing behavior.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOutdoor coil ices over and heating capacity drops\u003c\/li\u003e\n\u003cli\u003eHeat pump never enters defrost or defrosts far too often\u003c\/li\u003e\n\u003cli\u003eOutdoor fan or reversing valve not controlled correctly during defrost\u003c\/li\u003e\n\u003cli\u003eNo board LED activity or visible scorching 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":63021781057907,"sku":"1173636-GEN","price":145.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048447426931,"sku":"1173636","price":188.5,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-defrost-1173636_1792e2fa-5d48-492d-8fe0-41877e2d37b2.jpg?v=1782959936","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-defrost-control-board-for-t4h736gkd200-heat-pump-defrost-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}