{"product_id":"tempstar-defrost-control-board-for-t2h348gkd100-24v-heat-pump-ships-today","title":"Tempstar Defrost Control Board for T2H348GKD100 — 24V 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 T2H348GKD100 heat pump. The board monitors the defrost thermostat and elapsed run time, then reverses the system into defrost mode to melt frost off the outdoor coil during heating operation — switching the reversing valve, shutting off the outdoor fan, and energizing supplemental heat as needed. A failed defrost board leaves the outdoor coil iced over, which kills heating capacity, raises run times, and can cause the compressor to overheat or trip. Common failure signs include an outdoor unit that frosts\/ices up and never clears, no defrost cycle at all, the unit stuck in defrost, or no power to the contactor coil.\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\u003eOEM Part 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\u003e24 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eHeat-pump defrost timing \u0026amp; control\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 T2H348GKD100 and related ICP \/ Heil \/ Comfortmaker \/ Tempstar heat pump platforms that use this defrost control board. Match the board's part number and connector layout to your existing 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, then verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the outdoor unit's electrical access panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every wire harness and connector position on the existing board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug the connectors, release the board's 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 its standoffs and reconnect each harness to the matching terminal per your photo and the wiring diagram.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, initiate a heating call, and verify the defrost cycle and reversing-valve operation.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOutdoor coil ices over and never defrosts during heating.\u003c\/li\u003e\n\u003cli\u003eUnit gets stuck running in defrost mode.\u003c\/li\u003e\n\u003cli\u003eNo 24V output to the contactor, reversing valve, or fan.\u003c\/li\u003e\n\u003cli\u003eErratic heat-pump behavior or short cycling in cold weather.\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":63021819494771,"sku":"1173636-GEN","price":119.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048439759219,"sku":"1173636","price":155.94,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-defrost-1173636_62446bfe-0b53-461d-a621-9685e245fbd0.jpg?v=1782959665","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-defrost-control-board-for-t2h348gkd100-24v-heat-pump-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}