{"product_id":"tempstar-defrost-control-board-for-t4h524gkb100-heat-pump-ships-today","title":"Tempstar Defrost Control Board for T4H524GKB100 — Heat Pump | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis genuine OEM defrost control board (OEM part #1173636) manages the defrost cycle on the Tempstar T4H524GKB100 heat pump. The board monitors outdoor coil temperature and run time, then commands the reversing valve and outdoor fan to clear frost from the coil during cold-weather heating. It also coordinates compressor timing and auxiliary heat staging. A failed defrost board is a frequent cause of a heat pump that ices over, blows cold air in heat mode, or runs the outdoor fan erratically.\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\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eDefrost timing, reversing valve \u0026amp; fan control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eDirect OEM replacement for the Tempstar T4H524GKB100 and related ICP-family heat pumps (Heil, Comfortmaker, Arcoaire) that use defrost board 1173636. Verify the OEM number on your existing board before ordering.\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 main panel; verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the condenser electrical\/service panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every wire and connector position on the old board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug the harness connectors and remove the board from its standoffs\/screws.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new board, reconnect each connector and wire exactly per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and confirm normal operation; initiate or wait for a defrost cycle to verify reversing-valve and fan response.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOutdoor coil ices up and never defrosts\u003c\/li\u003e\n\u003cli\u003eHeat pump blows cold air during heating\u003c\/li\u003e\n\u003cli\u003eDefrost cycle runs constantly or never runs\u003c\/li\u003e\n\u003cli\u003eNo response from board LEDs or burnt\/scorched components\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":63021782761843,"sku":"1173636-GEN","price":165.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048446443891,"sku":"1173636","price":214.5,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-defrost-1173636_4f9900ca-7c5c-44a3-9164-0075e98a881c.jpg?v=1782959894","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-defrost-control-board-for-t4h524gkb100-heat-pump-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}