Part Number STH038 5/12 13Component Check ProceduresElectrical Components . . . . . . . . . . . . . . . 123Control Board, Display board and TouchPad . . . . . . . . . . . . . . . . . . . . . . . . . . . 123Control Board Relay Test . . . . . . . . . . 126USB Flash Drive Specifications and Format-ting . . . . . . . . . . . . . . . . . . . . . . . . . . . 128Upgrading Firmware with a Flash Drive orTransferring Setup Data To Multiple Ma-chines . . . . . . . . . . . . . . . . . . . . . . . . . 131Exporting Data to a Flash Drive . . . . . 133Programming A Replacement Control Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135Main Fuse . . . . . . . . . . . . . . . . . . . . . . 137Bin Switch . . . . . . . . . . . . . . . . . . . . . . 138Water Level Control Circuitry . . . . . . . 141Ice Thickness Probe (Harvest Initiation). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146High Pressure Cutout (HPCO) Control 151Fan Cycle Control . . . . . . . . . . . . . . . . 154Thermistors . . . . . . . . . . . . . . . . . . . . . 155Harvest Assist Air Pump . . . . . . . . . . . 159Compressor Electrical Diagnostics . . . 160Diagnosing Start Components . . . . . . 162Refrigerant Recovery/Evacuation/Chargingprocedures . . . . . . . . . . . . . . . . . . . . . 166Liquid Line Filter-Driers . . . . . . . . . . . . 166Total System Refrigerant Charge . . . . 166
