{"product_id":"tempstar-defrost-control-board-for-t2h348gka100-24v-heat-pump-board-ships-today","title":"Tempstar Defrost Control Board for T2H348GKA100 — 24V Heat Pump Board | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis OEM defrost control board (part number 1173636) manages the defrost cycle on the Tempstar T2H348GKA100 heat pump. Running on 24 volts, it monitors outdoor coil temperature and compressor run time, then commands the reversing valve, condenser fan, and auxiliary heat to melt frost and ice off the outdoor coil during heating season. A failed board can leave the heat pump iced over, blowing cold air in heat mode, short cycling, or skipping defrost altogether. Common symptoms include a frozen outdoor coil, no defrost cycle, the reversing valve not shifting, or auxiliary heat that never engages. Installing a new defrost board restores efficient, reliable heat-pump heating through the cold months.\u003c\/p\u003e\n\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\u003e24 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eDefrost timing \u0026amp; reversing-valve control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFits Model\u003c\/td\u003e\n\u003ctd\u003eT2H348GKA100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eDirect OEM replacement for the Tempstar T2H348GKA100 heat pump. This 24V defrost board is shared across many ICP-family outdoor heat pumps (Heil, Comfortmaker, Arcoaire) built on the same control platform. Verify the original part number 1173636 before ordering to ensure correct defrost timing and terminal layout.\u003c\/p\u003e\n\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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the outdoor unit's control panel cover.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every wire and connector on the board before removing anything.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug the harness connectors, release the board 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 and reconnect each harness exactly per your photo, including the defrost thermostat sensor lead.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and confirm normal heat-pump operation; force a defrost test if accessible to verify the cycle.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOutdoor coil ices or frosts over and never defrosts.\u003c\/li\u003e\n\u003cli\u003eHeat pump blows cold air in heating mode.\u003c\/li\u003e\n\u003cli\u003eReversing valve fails to shift during defrost.\u003c\/li\u003e\n\u003cli\u003eUnit short cycles or auxiliary heat never engages.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eShipping \u0026amp; Returns\u003c\/h3\u003e\n\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":63021819658611,"sku":"1173636-GEN","price":144.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048439660915,"sku":"1173636","price":188.44,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-defrost-1173636_223f6d2a-07b5-4015-91cc-d35be376ed63.jpg?v=1782959660","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-defrost-control-board-for-t2h348gka100-24v-heat-pump-board-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}