{"product_id":"icp-defrost-control-board-for-ya100ha1-heat-pump-timer-ships-today-1","title":"ICP Defrost Control Board for YA100HA1 — Heat Pump Timer | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis OEM defrost control board (part 1052757) is the brain of the ICP\/Tempstar\/Heil YA100HA1 heat pump's defrost cycle. In heating mode, frost builds on the outdoor coil; the defrost board monitors the defrost thermostat and an internal timer (typically 30\/60\/90-minute selectable intervals) to periodically reverse the system, melt the ice, and return to heating. It also coordinates the reversing valve, condenser fan, and auxiliary heat during defrost. When the board fails, the outdoor coil ices over and chokes airflow, heating capacity drops, the unit short-cycles, or defrost runs constantly. A failed board can also leave the reversing valve or fan misenergized, causing no-heat or no-defrost complaints. Installing the correct OEM defrost board restores proper, energy-efficient heat-pump operation.\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\u003e1052757\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\u003eICP (Tempstar \/ 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\u003eTimed Defrost Cycle Management\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitment\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 ICP\/Tempstar\/Heil YA100HA1 heat pump condensing unit and related ICP-family heat pumps using this defrost board. Verify the OEM board part number and connector layout before ordering.\u003c\/p\u003e\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety First\u003c\/strong\u003e — Disconnect power and verify zero voltage with a multimeter before touching the board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the condenser control-access panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph every connector and the defrost-timer jumper\/pin setting before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug each harness, 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, set the defrost interval jumper to match the original, and reconnect each harness per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, run a heating cycle, and confirm a proper timed defrost (forced defrost test if available).\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOutdoor coil iced over in heating mode\u003c\/li\u003e\n\u003cli\u003eNo defrost cycle or constant defrost\u003c\/li\u003e\n\u003cli\u003eWeak heating output or frequent short-cycling\u003c\/li\u003e\n\u003cli\u003eReversing valve or fan not switching during defrost\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":"ICP","offers":[{"title":"OEM","offer_id":63027198591347,"sku":"1052757","price":168.94,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047497449843,"sku":"1052757-GEN","price":129.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-defrost-1052757_0ba93921-a16f-448b-a159-cab2a66cb500.jpg?v=1782886647","url":"https:\/\/nationalhvacparts.com\/products\/icp-defrost-control-board-for-ya100ha1-heat-pump-timer-ships-today-1","provider":"National HVAC Parts","version":"1.0","type":"link"}