{"product_id":"tempstar-defrost-control-board-for-t4h436gkb200-oem-1173636-heat-pump-board-ships-today","title":"Tempstar Defrost Control Board for T4H436GKB200 — OEM 1173636 Heat Pump Board | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis genuine OEM defrost control board (part number 1173636) manages the defrost cycle on your Tempstar T4H436GKB200 heat pump. During cold-weather operation, frost accumulates on the outdoor coil and reduces heating efficiency. The defrost control board monitors coil temperature and run time, then commands a defrost cycle — reversing the refrigerant flow and energizing the auxiliary heat to clear ice from the coil. When this board fails, the unit may freeze over, stop heating, short-cycle, or run the defrost cycle continuously. A failed board is one of the most common causes of poor heat-pump performance in winter.\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\u003eControl Voltage\u003c\/td\u003e\n\u003ctd\u003e24V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eHeat Pump Defrost Control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eOEM Replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eEngineered as a direct OEM replacement for the Tempstar T4H436GKB200 heat pump. This board is shared across multiple ICP-family heat pumps (Tempstar, Heil, Comfortmaker, Arcoaire) — confirm part number 1173636 matches the board currently installed in your unit 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 outdoor disconnect and the breaker. Verify zero voltage with a multimeter before touching any wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the outdoor unit's control-panel service cover.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every wire and terminal position before disconnecting anything.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Label and disconnect the low-voltage and sensor leads, release the board's mounting standoffs or screws, and lift out the old board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new 1173636 board, reconnect each lead to the matching terminal per your photo, and seat the defrost sensor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and initiate a test defrost (jumper the speed-up pins per the unit's wiring diagram) to confirm the reversing valve and aux heat energize.\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 the unit never defrosts\u003c\/li\u003e\n\u003cli\u003eHeat pump runs a defrost cycle constantly or at the wrong intervals\u003c\/li\u003e\n\u003cli\u003eNo heat output or frequent short-cycling in cold weather\u003c\/li\u003e\n\u003cli\u003eReversing valve or auxiliary heat fails to energize on call for defrost\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eShipping \u0026amp; Returns\u003c\/h3\u003e\u003cp\u003eShips same day on orders placed 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":63021786431859,"sku":"1173636-GEN","price":134.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048444150131,"sku":"1173636","price":175.44,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-defrost-1173636_03033f9a-c5e4-4fed-a9c1-e0253b12a25a.jpg?v=1782959830","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-defrost-control-board-for-t4h436gkb200-oem-1173636-heat-pump-board-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}