{"product_id":"tempstar-defrost-control-board-for-t4h324gka100-oem-1173636-heat-pump-board-ships-today","title":"Tempstar Defrost Control Board for T4H324GKA100 — OEM 1173636 Heat Pump Board | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis is a genuine OEM defrost control board (part number 1173636) for the Tempstar T4H324GKA100 heat pump condensing unit. The defrost control board is the brain of the heat pump's defrost cycle — it monitors the outdoor coil temperature and accumulated run time, then commands the system to reverse into a temporary cooling cycle to melt frost and ice off the outdoor coil during winter operation. It coordinates the reversing valve, condenser fan, and compressor timing to keep the unit running efficiently. When this board fails, the outdoor coil can ice over completely, heating capacity drops, and the compressor may short-cycle or lock out on a fault. Operating on 24V control logic, this board is a direct factory replacement.\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\u003e24V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eHeat Pump Defrost Cycle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eOEM Direct Replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eDesigned as a direct-fit OEM replacement for the Tempstar T4H324GKA100 heat pump. The 1173636 board is also used across many ICP-family (Tempstar, Heil, Comfortmaker, Arcoaire) heat pump models that share this control platform. Always verify your existing board's part number before ordering.\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 outdoor disconnect and verify zero voltage with a multimeter before touching any wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the condenser unit's control-panel access cover.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every wire and terminal connection 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 sensor leads, release the board's mounting standoffs or screws, and lift out the old board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new 1173636 board, then reconnect each lead exactly as shown in your photos. Reconnect the defrost thermostat\/sensor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and confirm normal heating operation; force or wait for a defrost cycle to verify the board commands it correctly.\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 freezes or ices over and never defrosts\u003c\/li\u003e\n\u003cli\u003eHeat pump fails to switch to defrost or stays in defrost too long\u003c\/li\u003e\n\u003cli\u003eCompressor short-cycles or locks out during heating mode\u003c\/li\u003e\n\u003cli\u003eVisible burn marks, corrosion, or scorched components on the board\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eShipping \u0026amp; Returns\u003c\/h3\u003e\n\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":63021802848627,"sku":"1173636-GEN","price":129.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048440447347,"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_6f6387c3-714a-4c06-bba8-17cf5b33a0d9.jpg?v=1782959692","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-defrost-control-board-for-t4h324gka100-oem-1173636-heat-pump-board-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}