{"product_id":"tempstar-defrost-control-board-for-t4h436gkc200-oem-1173636-ships-today","title":"Tempstar Defrost Control Board for T4H436GKC200 — OEM 1173636 | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis is a genuine OEM Defrost Control Board (part number 1173636) for the Tempstar T4H436GKC200 heat pump. The defrost board is the brain of the outdoor unit's heating operation: it monitors the defrost thermostat and a timed interval to determine when frost has built up on the outdoor coil, then reverses the system into defrost mode, energizes the reversing valve, stops the outdoor fan, and brings on auxiliary heat. A failed defrost board causes the outdoor coil to ice over (killing heating capacity), or causes the unit to defrost too often or not at all. Boards fail from voltage surges, relay burnout, and corrosion.\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\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eHeat-pump defrost cycle management\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFit\u003c\/td\u003e\n\u003ctd\u003eOEM Direct Replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eDirect-fit OEM replacement for the Tempstar T4H436GKC200 and other ICP-family heat pumps (Tempstar, Heil, Comfortmaker) specifying board 1173636. Defrost timing pins\/jumpers must be set to match your original board — note the existing jumper position before swapping.\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 verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the condenser control-box access panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every connector, wire color\/terminal, and the defrost-timing jumper position.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug the low-voltage and line-voltage connectors and unscrew\/unclip the board from its standoffs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new board, set the timing jumper to match the original, and reconnect all wiring per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and initiate a defrost test (per the board's forced-defrost procedure) to confirm correct operation.\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 in heating mode.\u003c\/li\u003e\n\u003cli\u003eUnit defrosts constantly or at the wrong times.\u003c\/li\u003e\n\u003cli\u003eNo 24V output to the reversing valve or fan during defrost.\u003c\/li\u003e\n\u003cli\u003eVisible burnt relay, scorch marks, or corroded traces on the board.\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 on unused parts. Backed by the National HVAC Parts fitment guarantee.\u003c\/p\u003e","brand":"Tempstar","offers":[{"title":"Direct Replacement","offer_id":63021786104179,"sku":"1173636-GEN","price":165.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048444248435,"sku":"1173636","price":214.5,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-defrost-1173636_db0fef8d-0db9-481e-8196-4d4b5ea9b046.jpg?v=1782959834","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-defrost-control-board-for-t4h436gkc200-oem-1173636-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}