{"product_id":"tempstar-defrost-control-board-for-t4h560gkd200-oem-1173636-ships-today","title":"Tempstar Defrost Control Board for T4H560GKD200 — OEM 1173636 | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe OEM Tempstar Defrost Control Board (part number 1173636) governs the defrost cycle on your T4H560GKD200 heat pump. It tracks outdoor coil temperature and accumulated run time, then signals the reversing valve, outdoor fan, and auxiliary heat to melt frost off the outdoor coil during heating operation. A failed 24V logic board means the system can no longer time or trigger defrost, so the outdoor coil ices over, heating output collapses, and the unit may trip on a pressure fault. Typical failure signs include a heat pump that freezes solid in winter, little or no heat, an outdoor fan that runs continuously, or blank\/erratic diagnostic LEDs. Replacing it with a genuine OEM board restores correct defrost timing and shields 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 T4H560GKD200 heat pump and shared ICP \/ Heil \/ Comfortmaker platforms using 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 run 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":63021781549427,"sku":"1173636-GEN","price":124.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048447099251,"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_12ccafcd-8382-4983-81a9-778f37850905.jpg?v=1782959922","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-defrost-control-board-for-t4h560gkd200-oem-1173636-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}