{"product_id":"tempstar-defrost-control-board-for-t4h424gkb200-oem-1173636-ships-today","title":"Tempstar Defrost Control Board for T4H424GKB200 — OEM 1173636 | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe defrost control board (OEM part 1173636) governs the defrost cycle on your Tempstar T4H424GKB200 heat pump. It watches outdoor coil temperature and compressor run time, then commands the reversing valve and shuts off the outdoor fan to melt frost off the coil so the system keeps delivering heat. A failed board causes ice buildup on the coil, constant or absent defrost cycles, short-cycling, or a complete loss of heating. This is a genuine 24V OEM replacement built to the original specifications.\u003c\/p\u003e\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)\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 Defrost Control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eOEM Direct Replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eDirect-fit replacement for the Tempstar T4H424GKB200 heat pump and other ICP-family heat pumps sold under the Tempstar, Heil, Comfortmaker, and ICP brands that use OEM 1173636. Match the number on your existing board to confirm fitment.\u003c\/p\u003e\n\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\n\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 before touching any wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the outdoor unit's control-panel service cover.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every wire and connector on the old board before disconnecting anything.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug the low-voltage harnesses, release the mounting standoffs or screws, and lift out the old defrost board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new 1173636 board, reconnect each harness exactly as photographed, and set any defrost-timing jumper to match the original.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and verify the unit enters and exits a defrost cycle correctly.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOutdoor coil stays iced or frosted over in cold weather\u003c\/li\u003e\n\u003cli\u003eHeat pump runs in defrost constantly or never defrosts\u003c\/li\u003e\n\u003cli\u003eNo heat output or repeated short-cycling\u003c\/li\u003e\n\u003cli\u003eBurn marks, corrosion, or a damaged trace on the old board\u003c\/li\u003e\n\u003c\/ul\u003e\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":63021787906419,"sku":"1173636-GEN","price":149.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048443396467,"sku":"1173636","price":193.7,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-defrost-1173636_425bf51d-1de7-473f-a890-03170d0238c6.jpg?v=1782959797","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-defrost-control-board-for-t4h424gkb200-oem-1173636-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}