{"product_id":"tempstar-defrost-control-board-for-tch248aka1-oem-1086070-ships-today","title":"Tempstar Defrost Control Board for TCH248AKA1 — OEM 1086070 | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis genuine OEM defrost control board (part number 1086070) is the logic center of your Tempstar TCH248AKA1 heat pump's defrost cycle. It monitors the defrost thermostat and timer intervals, then commands the reversing valve, outdoor fan, and auxiliary heat to clear frost from the outdoor coil during cold-weather operation. When this board fails, the heat pump can ice over solid, lose heating capacity, short-cycle, or skip defrost entirely. The board manages 24V control signals and the high-voltage relays for the outdoor fan and compressor circuit. It is a direct OEM replacement that preserves the factory defrost timing and sequencing.\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\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; fan control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eBuilt for the Tempstar TCH248AKA1 heat pump and used across matching ICP, Heil, Comfortmaker, and Arcoaire outdoor units with the same defrost board layout and connector configuration. Match the existing board part number and terminal pinout before installing.\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 and breaker, then verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the condenser control-box access panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every connector and wire position; note the defrost timer jumper setting (30\/60\/90 min).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug the connectors, release the standoffs or screws, and lift out the old board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new board, match the timer jumper to the original, and reconnect all leads per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, run a heat call, and confirm the unit enters and exits defrost correctly.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOutdoor coil ices over and never clears\u003c\/li\u003e\n\u003cli\u003eHeat pump never enters defrost in cold weather\u003c\/li\u003e\n\u003cli\u003eReversing valve or outdoor fan fails to switch during defrost\u003c\/li\u003e\n\u003cli\u003eRandom short-cycling or no response to a heat call\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":63021656342899,"sku":"1086070-GEN","price":149.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048448049523,"sku":"1086070","price":194.94,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-defrost-1086070_9c5e1481-96f9-4d57-87e2-2feaba170d42.jpg?v=1782959960","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-defrost-control-board-for-tch248aka1-oem-1086070-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}