{"product_id":"icp-defrost-control-board-for-ryma75f001c-heat-pump-timer-sensor-board-ships-today","title":"ICP Defrost Control Board for RYMA75F001C — Heat Pump Timer\/Sensor Board | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis OEM defrost control board (part #1052757) is the electronic brain of the ICP \/ Tempstar \/ Heil RYMA75F001C heat pump's defrost cycle. It monitors the coil temperature sensor and accumulated run time, then commands the reversing valve, condenser fan, and auxiliary heat to clear frost from the outdoor coil during cold-weather operation. The board manages defrost timing intervals, fan shutdown during defrost, and the changeover relay logic. A failed defrost board leaves the outdoor coil to ice over, kills heating capacity, and can trip the unit on high pressure or stick it in a single mode.\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\u003e24 VAC\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\u003eDesigned for the ICP RYMA75F001C heat pump and the matching Tempstar, Heil, and Comfortmaker RYMA-series outdoor units. Confirm the connector layout and defrost timing pin selection match your original board.\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 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photo every connector and the defrost-timing pin\/jumper setting before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug each harness and unscrew the old board from its standoffs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new board, set the defrost timing pin to match the original, and reseat every connector per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, initiate a defrost (or forced defrost) and confirm the reversing valve, fan, and aux heat respond 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 won't enter or exit defrost\u003c\/li\u003e\n\u003cli\u003eNo 24V output to reversing valve or fan\u003c\/li\u003e\n\u003cli\u003eErratic mode switching or scorched board traces\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. National HVAC Parts fitment guarantee.\u003c\/p\u003e","brand":"ICP","offers":[{"title":"OEM","offer_id":63021834436979,"sku":"1052757","price":194.94,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047491125619,"sku":"1052757-GEN","price":149.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-defrost-1052757_7dc0d823-9c91-48c0-982b-b9a46dad7f64.jpg?v=1782886423","url":"https:\/\/nationalhvacparts.com\/products\/icp-defrost-control-board-for-ryma75f001c-heat-pump-timer-sensor-board-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}