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