{"product_id":"tempstar-defrost-control-board-for-txh536gka200-heat-pump-defrost-ships-today","title":"Tempstar Defrost Control Board for TXH536GKA200 — Heat Pump Defrost | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis is the genuine OEM Tempstar defrost control board, part number \u003cstrong\u003e1173636\u003c\/strong\u003e, for the TXH536GKA200 heat pump condensing unit. The defrost control board governs the outdoor unit's heating cycle — it watches coil temperature and accumulated run time, then triggers a timed defrost to melt ice off the outdoor coil so the heat pump keeps producing heat. During defrost it energizes the reversing valve, stages the compressor and outdoor fan, and signals the indoor unit. A failed board causes the coil to frost over, defrost to run nonstop or never start, or the system to stop switching between heating and cooling. It runs on a 24V control circuit and is the correct factory replacement for this model.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\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 family)\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 Outdoor Unit\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\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eBuilt as the factory-correct defrost board for the Tempstar TXH536GKA200 heat pump. Because Tempstar shares components across the ICP family, this board also services equivalent Heil, Comfortmaker, and ICP units that originally specified part 1173636. Always verify the printed part number on your existing board before ordering.\u003c\/p\u003e\n\n\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety First\u003c\/strong\u003e — Disconnect power at the outdoor disconnect and breaker; verify zero voltage with a multimeter before touching wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the control-panel access cover on the condensing unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every wire and terminal on the existing board before disconnecting anything.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Label and unplug the harnesses, then unscrew the failed board from its standoffs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new board on the standoffs and reconnect each harness exactly per your photos and labels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, force a defrost cycle, and confirm the reversing valve, compressor, and fan sequence correctly.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOutdoor coil ices over and heating output falls off.\u003c\/li\u003e\n\u003cli\u003eUnit stuck in continuous defrost or never defrosting.\u003c\/li\u003e\n\u003cli\u003eNo changeover between heat and cool (reversing valve not energizing).\u003c\/li\u003e\n\u003cli\u003eVisible burn marks, corrosion, or failed relays on the existing board.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eShipping \u0026amp; Returns\u003c\/h3\u003e\n\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":63021625278835,"sku":"1173636-GEN","price":139.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048448999795,"sku":"1173636","price":180.7,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-defrost-1173636_b4937faa-4194-4968-a882-e9f689bd537b.jpg?v=1782959999","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-defrost-control-board-for-txh536gka200-heat-pump-defrost-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}