{"product_id":"tempstar-defrost-control-board-for-tch424aka1-oem-1086070-ships-today","title":"Tempstar Defrost Control Board for TCH424AKA1 — OEM 1086070 | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis genuine OEM defrost control board (part number 1086070) is the brain of the Tempstar TCH424AKA1 heat pump's outdoor section. It monitors coil temperature and run time, then initiates and terminates defrost cycles to clear frost from the outdoor coil in cold weather. The board also sequences the compressor contactor, condenser fan, reversing valve coil, and auxiliary\/emergency heat hand-off. When this board fails, the heat pump may ice over, fail to defrost, short-cycle, or lose heating and cooling control entirely. A new OEM board restores correct defrost timing and protects the compressor.\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\u003e1086070\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\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eDefrost Timing, Reversing Valve \u0026amp; Contactor Control\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 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\u003eDirect-fit OEM replacement for the Tempstar TCH424AKA1 heat pump. This defrost board is used across many ICP-family heat pumps (Tempstar, Heil, Comfortmaker) of the same generation. Confirm the printed board part number and connector layout against 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 breaker and pull the outdoor disconnect, then verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the condenser service panel to reach the control box and board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every connector, wire color, and terminal position before unplugging anything.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug each connector and sensor lead, then release the board's standoffs or mounting screws and lift it out.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new board on the standoffs and reconnect each plug and sensor exactly per your photos, checking any defrost-timing jumper\/DIP settings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, confirm normal heating\/cooling operation, and verify the board enters and exits a defrost cycle 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 ices over and the unit never defrosts.\u003c\/li\u003e\n\u003cli\u003eHeat pump short-cycles or won't switch between heat and cool.\u003c\/li\u003e\n\u003cli\u003eNo 24V output to the contactor, fan, or reversing valve.\u003c\/li\u003e\n\u003cli\u003eVisible scorch marks, burned relays, or a cracked 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":63021655687539,"sku":"1086070-GEN","price":149.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048448246131,"sku":"1086070","price":193.7,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-defrost-1086070_11e419d7-0e69-4310-89d3-26a80409a418.jpg?v=1782959969","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-defrost-control-board-for-tch424aka1-oem-1086070-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}