{"product_id":"tempstar-defrost-control-board-for-t2h336gka100-24v-heat-pump-board-ships-today","title":"Tempstar Defrost Control Board for T2H336GKA100 — 24V Heat Pump Board | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis is a genuine OEM defrost control board (part number 1173636) for the Tempstar T2H336GKA100 heat pump. The defrost control board is the brain of the outdoor unit's defrost cycle — it monitors coil temperature and run time, then commands the reversing valve and auxiliary heat to clear frost and ice from the outdoor coil during cold-weather operation. It also coordinates compressor timing, fan operation, and 24V control signals between the thermostat and the unit. When this board fails, the heat pump can ice over, lose heating capacity, short-cycle, or stop responding to the thermostat entirely. Replacing it with the correct OEM board restores reliable defrost timing and protects the compressor from liquid slugging.\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 (outdoor unit)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eOEM Replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eEngineered as a direct-fit replacement for the Tempstar T2H336GKA100 heat pump. This board is shared across many ICP-family (Heil, Comfortmaker, Tempstar, Arcoaire) heat pumps that use the 1173636 defrost board. Always confirm the part number printed 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 box and breaker, then verify zero voltage at the unit with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the outdoor unit's control-panel access cover.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every wire and terminal position 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 leads, release the board's mounting standoffs\/screws, and lift out the old board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new board on the standoffs and reconnect each wire exactly per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and confirm normal heating, fan, and a forced defrost cycle.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOutdoor coil freezes over and the unit never defrosts.\u003c\/li\u003e\n\u003cli\u003eHeat pump fails to switch into or out of defrost mode.\u003c\/li\u003e\n\u003cli\u003eCompressor or outdoor fan won't start despite a good thermostat call.\u003c\/li\u003e\n\u003cli\u003eVisible burn marks, corrosion, or a faulty relay on the board.\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":63021821264243,"sku":"1173636-GEN","price":129.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048439169395,"sku":"1173636","price":167.7,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-defrost-1173636_5238dcdd-b813-414a-9520-a565b7a94380.jpg?v=1782959638","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-defrost-control-board-for-t2h336gka100-24v-heat-pump-board-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}