{"product_id":"tempstar-defrost-control-board-for-t4h442gkc200-heat-pump-defrost-board-ships-today","title":"Tempstar Defrost Control Board for T4H442GKC200 — Heat Pump Defrost 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 T4H442GKC200 heat pump. It monitors coil temperature and run time, then periodically reverses the system to melt frost off the outdoor coil before returning to heating. The board also coordinates the compressor, condenser fan, reversing valve, and auxiliary heat timing. When it fails, the outdoor coil ices over and chokes airflow, the unit gets stuck in or out of defrost, or the heat pump stops responding to calls entirely. Symptoms include a heavily frosted outdoor coil, no defrost cycle, continuous defrost, fan or compressor not energizing, or no output to the reversing valve.\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\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eDefrost timing \u0026amp; outdoor unit 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\u003eExact-fit OEM replacement for the Tempstar T4H442GKC200 and related ICP-family (Tempstar, Heil, Comfortmaker) heat pumps using the 1173636 defrost board. Confirm the board part number, connector layout, and defrost timing pin settings against 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 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 control-area service panel to expose the defrost board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every connector, plug, and the defrost-time jumper position before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug the harnesses, release the board standoffs\/screws, and lift out the old board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new board, set the defrost timing pin to match the original, and reconnect each harness per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, run a heat call, and confirm normal operation and a proper defrost cycle.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOutdoor coil ices over with no defrost cycle\u003c\/li\u003e\n\u003cli\u003eUnit stuck running continuous defrost\u003c\/li\u003e\n\u003cli\u003eCompressor or fan won't energize on a heat call\u003c\/li\u003e\n\u003cli\u003eNo 24V output to the reversing valve during defrost\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":63021785350515,"sku":"1173636-GEN","price":148.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048444805491,"sku":"1173636","price":192.4,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-defrost-1173636_c846a2d4-4afa-4bc3-8c74-61c55ff50c20.jpg?v=1782959851","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-defrost-control-board-for-t4h442gkc200-heat-pump-defrost-board-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}