{"product_id":"icp-defrost-control-board-for-yd018ga-oem-heat-pump-defrost-board-ships-today-1","title":"ICP Defrost Control Board for YD018GA – OEM Heat Pump Defrost Board | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis genuine OEM defrost control board (part number 34330100) manages the defrost cycle on the ICP \/ Tempstar \/ Heil YD018GA heat pump. In heating mode, frost and ice build up on the outdoor coil; the defrost board monitors coil temperature and elapsed run time, then periodically reverses the unit into a brief cooling cycle to melt the ice while the auxiliary heat protects supply temperature. The board coordinates the reversing valve, the outdoor fan, and the defrost timer\/sensor inputs. When it fails, the heat pump either ices over completely (no defrost) or defrosts constantly (wasting energy and short-cycling). Because the board carries both line and low-voltage signals, failures often show up as a dead outdoor unit, an iced coil that never clears, or erratic mode switching.\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\u003e34330100\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\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eDefrost cycle timing \u0026amp; coordination\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\u003eFit\u003c\/td\u003e\n\u003ctd\u003eOEM Replacement\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\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eDirect OEM replacement for the ICP \/ Tempstar \/ Heil YD018GA heat pump and other ICP-family outdoor units that specify the 34330100 defrost control board. Verify the part number and connector layout on 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 disconnect and breaker, then verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e – Remove the condensing unit service panel to reach the control box.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e – Photograph every wire and connector plugged into the old board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e – Unplug the connectors, release the mounting standoffs\/screws, and lift out the old board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e – Seat the new board on the standoffs and reconnect every plug exactly per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e – Restore power, run a heat call, and confirm normal operation; initiate a forced defrost (per the board's test pins) to verify the cycle.\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 never defrosts in heating mode.\u003c\/li\u003e\n\u003cli\u003eUnit goes into defrost constantly or at the wrong times.\u003c\/li\u003e\n\u003cli\u003eOutdoor unit completely dead despite good incoming power.\u003c\/li\u003e\n\u003cli\u003eErratic reversing-valve or fan behavior during defrost.\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":"ICP","offers":[{"title":"OEM","offer_id":63027197477235,"sku":"34330100","price":193.7,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047499612531,"sku":"34330100-GEN","price":149.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-defrost-34330100.jpg?v=1782886718","url":"https:\/\/nationalhvacparts.com\/products\/icp-defrost-control-board-for-yd018ga-oem-heat-pump-defrost-board-ships-today-1","provider":"National HVAC Parts","version":"1.0","type":"link"}