{"product_id":"tempstar-defrost-control-board-for-tch442aka1-heat-pump-ships-today","title":"Tempstar Defrost Control Board for TCH442AKA1 — Heat Pump | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis OEM defrost control board (Tempstar part #1086070) is the brain of the outdoor unit on your TCH442AKA1 heat pump. It monitors the defrost thermostat and outdoor coil temperature, times the defrost interval, and commands the reversing valve, compressor, and fan to clear frost from the outdoor coil during cold-weather operation. It also coordinates the contactor and any auxiliary\/emergency heat staging. When this board fails, the heat pump may never defrost (ice builds on the outdoor coil), defrost too often and waste energy, fail to switch between heating and cooling, or lose outdoor unit operation entirely. Because the board interfaces with nearly every major component, a faulty defrost board often mimics other failures — confirm with the unit's diagnostic LED flash codes before replacing.\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\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 Outdoor Unit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFit\u003c\/td\u003e\n\u003ctd\u003eOEM Replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eDesigned for the Tempstar TCH442AKA1 heat pump and used across matching ICP \/ Tempstar \/ Heil \/ Comfortmaker heat pump condensers that share this defrost control platform. Match the board's part number and connector layout to your existing board 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; 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's electrical control panel to expose the board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every wire and plug connection; note the defrost timing pin\/jumper setting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug each connector, release the board's mounting standoffs\/screws, and lift it out.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new board, set the defrost timing jumper to match the original, and reconnect every plug per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, initiate a forced defrost (per the board's test pins), and confirm proper defrost, mode switching, and LED status.\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 goes into defrost\u003c\/li\u003e\n\u003cli\u003eUnit defrosts too frequently or gets stuck in defrost\u003c\/li\u003e\n\u003cli\u003eHeat pump won't switch between heating and cooling\u003c\/li\u003e\n\u003cli\u003eDiagnostic LED shows a board fault or no outdoor unit operation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eShipping \u0026amp; Returns\u003c\/h3\u003e\u003cp\u003eShips same day on orders placed before 3 PM CST. 30-day hassle-free returns. Backed by the National HVAC Parts fitment guarantee.\u003c\/p\u003e","brand":"Tempstar","offers":[{"title":"Direct Replacement","offer_id":63021654966643,"sku":"1086070-GEN","price":149.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048448409971,"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_5baf5fe2-3b43-45b6-9b1a-db5014f716b9.jpg?v=1782959975","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-defrost-control-board-for-tch442aka1-heat-pump-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}