{"product_id":"tempstar-defrost-control-board-for-t4h418gkd200-heat-pump-board-ships-today","title":"Tempstar Defrost Control Board for T4H418GKD200 — Heat Pump Board | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis genuine OEM defrost control board (part #1173636) is the brain of the defrost cycle on your Tempstar T4H418GKD200 heat pump. In heating mode, frost builds on the outdoor coil; the defrost board monitors coil temperature and elapsed run time, then periodically reverses the system into a brief defrost cycle to melt that frost and restore efficiency. The board also coordinates the reversing valve, condenser fan, and compressor timing. When it fails, the outdoor coil can ice over completely, heating capacity drops, and the system may short-cycle or lock out. This OEM replacement guarantees correct timing logic and connector pinout for your unit.\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 AC\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\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\u003eBuilt for the Tempstar T4H418GKD200 heat pump and other ICP-family outdoor units (Heil, Comfortmaker, Arcoaire) using this defrost board. Match the part number and connector layout to your existing board before installing.\u003c\/p\u003e\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety First\u003c\/strong\u003e — Disconnect power and verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the condenser control box cover.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every wire and plug position on the old board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug the harness connectors and remove the mounting screws\/standoffs holding the board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new board, transfer the defrost timing jumper to the same pin setting, and reconnect all plugs per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, run a heating cycle, and confirm the board initiates and terminates defrost correctly.\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 never defrosts in heating mode\u003c\/li\u003e\n\u003cli\u003eHeat pump stuck in defrost or running defrost too frequently\u003c\/li\u003e\n\u003cli\u003eCondenser fan or compressor not sequencing properly\u003c\/li\u003e\n\u003cli\u003eNo defrost LED activity or fault codes 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. National HVAC Parts fitment guarantee.\u003c\/p\u003e","brand":"Tempstar","offers":[{"title":"Direct Replacement","offer_id":63021788234099,"sku":"1173636-GEN","price":145.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048443167091,"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_c200573a-a38a-4ba3-91ef-48d329ff23e1.jpg?v=1782959787","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-defrost-control-board-for-t4h418gkd200-heat-pump-board-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}