{"product_id":"tempstar-defrost-control-board-for-t4h560gkd300-oem-1173636-ships-today","title":"Tempstar Defrost Control Board for T4H560GKD300 — OEM 1173636 | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe OEM Tempstar Defrost Control Board (part number 1173636) is the brain of the defrost cycle on your T4H560GKD300 heat pump. It monitors coil temperature and run time, then commands the reversing valve, outdoor fan, and auxiliary heat to clear frost from the outdoor coil during cold-weather operation. When this 24V logic board fails, the system can no longer time or initiate defrost — leaving the outdoor coil to ice over, killing heating capacity, and tripping the unit on high or low pressure. Common failure signs include a heat pump that freezes solid in winter, no heat output, an outdoor fan that runs continuously, or blank\/erratic LED diagnostic codes on the board itself. Installing a genuine OEM board restores correct defrost timing and protects the compressor from liquid slugging caused by mistimed reversing-valve switching.\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 family)\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\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eDemand \/ time-temperature defrost logic\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\u003eEngineered as a direct OEM fit for the Tempstar T4H560GKD300 heat pump and shared ICP \/ Heil \/ Comfortmaker \/ Heil platforms that use board 1173636. Always confirm the printed part number on your existing board 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 disconnect and breaker, then verify zero voltage at the board with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the outdoor unit control-panel cover.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every wire and terminal position before disconnecting anything.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Label and unplug the low-voltage harnesses, release the board standoffs\/screws, and lift out the old defrost board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Snap the new 1173636 board onto the standoffs and reconnect each harness exactly per your photos, matching the W, Y, O, and sensor terminals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, confirm the diagnostic LED is steady, and initiate a defrost test to verify reversing-valve and fan response.\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 up and never defrosts in heating mode\u003c\/li\u003e\n\u003cli\u003eNo heat or weak heat output during cold weather\u003c\/li\u003e\n\u003cli\u003eOutdoor fan runs nonstop or won't shut off during defrost\u003c\/li\u003e\n\u003cli\u003eBurnt, scorched, or unlit diagnostic LEDs 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":63021781451123,"sku":"1173636-GEN","price":124.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048447164787,"sku":"1173636","price":162.44,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-defrost-1173636_81382781-84e7-41b8-9809-acea409cb6f0.jpg?v=1782959924","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-defrost-control-board-for-t4h560gkd300-oem-1173636-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}