{"product_id":"tempstar-defrost-control-board-for-t4h461gkd100-oem-1173636-ships-today","title":"Tempstar Defrost Control Board for T4H461GKD100 — OEM 1173636 | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThe Tempstar defrost control board (OEM #1173636) is the brain of the defrost cycle on your T4H461GKD100 heat pump. It monitors outdoor coil temperature and run time, then commands the reversing valve, compressor, and outdoor fan to clear frost and ice from the outdoor coil during cold-weather operation. When this board fails, the system can no longer initiate or terminate defrost correctly — leaving the outdoor unit caked in ice, blowing cold air on heat mode, or short-cycling. This is a genuine OEM replacement, calibrated to the exact defrost intervals and sensor inputs your unit was engineered around, so you avoid the trial-and-error of universal aftermarket boards.\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 Outdoor Unit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFits Model\u003c\/td\u003e\n\u003ctd\u003eT4H461GKD100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eEngineered for the Tempstar T4H461GKD100 heat pump and shared across many ICP-family outdoor units, including Heil, Comfortmaker, and Carrier\/Bryant-built equivalents that use the same defrost platform. Always confirm the OEM number (1173636) against your old 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; verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the outdoor unit's control-panel access 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 unplug all low- and line-voltage connectors, release the board's mounting standoffs\/screws, and lift out the old board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Seat the new board on the standoffs, reconnect each wire to its matching terminal per your photo, and confirm the defrost sensor lead is secure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and run a heat-mode\/defrost cycle to verify the reversing valve and outdoor fan respond correctly.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOutdoor coil builds heavy ice and never defrosts\u003c\/li\u003e\n\u003cli\u003eHeat pump blows cold air in heating mode\u003c\/li\u003e\n\u003cli\u003eSystem short-cycles or won't initiate defrost\u003c\/li\u003e\n\u003cli\u003eVisible burnt traces, scorched relays, or a chemical smell on the old 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. Backed by the National HVAC Parts fitment guarantee.\u003c\/p\u003e","brand":"Tempstar","offers":[{"title":"Direct Replacement","offer_id":63021782991219,"sku":"1173636-GEN","price":159.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048446280051,"sku":"1173636","price":206.7,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-defrost-1173636_e0e6d6bc-0676-4bba-af66-99257a66c003.jpg?v=1782959887","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-defrost-control-board-for-t4h461gkd100-oem-1173636-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}