{"product_id":"tempstar-defrost-control-board-for-t2h324gkd100-heat-pump-timer-ships-today","title":"Tempstar Defrost Control Board for T2H324GKD100 — Heat Pump Timer | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis is the OEM defrost control board (part number 1173636) for the Tempstar T2H324GKD100 heat pump. The defrost control board is the brain of the heat pump's defrost cycle — it monitors outdoor coil temperature and run time, then reverses the system into defrost mode to melt frost and ice off the outdoor coil during heating operation. It coordinates the reversing valve, outdoor fan motor, and auxiliary heat. When this board fails, the unit may ice over completely, fail to defrost, run the compressor without defrosting, or lock out on a fault. Common failure symptoms include the outdoor coil staying frozen, no heat output, the system stuck in defrost, or relays that chatter and won't pull in.\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 Defrost 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\u003eDirect-fit OEM replacement for the Tempstar T2H324GKD100 heat pump. This board is shared across many ICP-family heat pumps (Tempstar, Heil, Comfortmaker, Arcoaire) built on the same platform. Always confirm the printed part number 1173636 matches the board you are removing 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 at the control board with a multimeter before touching wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the outdoor unit's control-access service panel.\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 disconnect the low-voltage and line-voltage connections, release the board standoffs\/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 on the same standoffs and reconnect each wire to the matching terminal per your photos. Set any defrost timing jumper to match the original.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and confirm normal heating, then initiate a test defrost (per the board's forced-defrost procedure) to verify the reversing valve and fan respond.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOutdoor coil ices or frosts over and never clears during heating\u003c\/li\u003e\n\u003cli\u003eHeat pump produces little or no heat in cold weather\u003c\/li\u003e\n\u003cli\u003eSystem stuck running in defrost, or never enters defrost\u003c\/li\u003e\n\u003cli\u003eRelays on the board are burnt, chattering, or won't energize\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":63021822116211,"sku":"1173636-GEN","price":149.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048438841715,"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_eb6dd2f7-ffc3-4727-a93b-47f04d4586df.jpg?v=1782959625","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-defrost-control-board-for-t2h324gkd100-heat-pump-timer-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}