Fault System Diagnosis Guide - U-Line U-3018RFOL-00 Service Manual

Fault System Diagnosis Guide

Error
No Comm
Zone T Open
Evap T Open
Amb Thrm Open
Zone T Short
Evap T Short
Amb Thrm Short
Temp Hi 6H+
Temp Hi 12H+
Temp Lo 6H+
Temp Lo 12H+
Door Open 5M
Solution 1
Inspect the UI data cable for
continuity. Replace if necessary.
he main control board and UI.
Inspect zone thermistor connection.
Replace if necessary.
Inspect evaporator thermistor
connection. Replace if necessary.
Inspect ambient thermistor
connection. Replace if necessary.
Inspect thermistor cable for pinch
points or damage. Replace if
necessary.
Inspect thermistor cable for pinch
points or damage. Replace if
necessary.
Inspect thermistor cable for pinch
points or damage. Replace is
necessary.
If excessive frost is also noted,
inspect door and door gasket for
proper seal and alignment.
If excessive frost is also noted,
inspect door and door gasket for
proper seal and alignment.
Inspect main control for proper relay
operation.
Inspect main control for proper relay
operation.
Verify door closes properly.
U-Line Service
Solution 2
Inspect main control wire harness for
splits or breaks. Repair split or cut
cabling.
Inspect main control wire harness for
splits or breaks. Repair split or cut
cabling.
Inspect main control wire harness for
splits or breaks. Repair split or cut
cabling.
Inspect wire harness from main
control board for pinch points or
damage. Repair split or pinched
cabling.
Inspect wire harness from main
control board for pinch points or
damage. Repair split or pinched
cabling.
Inspect wire harness from main
control board for pinch points or
damage. Repair split or pinched
cabling.
Inspect evaporator fan for proper
operation.
Inspect evaporator fan for proper
operation.
Inspect refrigeration system.
Reference the Refrigeration System
Diagnosis Guide on page 26.
Inspect refrigeration system.
Reference the Refrigeration System
Diagnosis Guide on page 26.
Inspect cable arm, verify presence of
magnet, verify proper operation and
movement or arm.
Troubleshooting
Solution 3
Inspect refrigeration system.
Reference the Refrigeration System
Diagnosis Guide on page 26.
Inspect refrigeration system.
Reference the Refrigeration System
Diagnosis Guide on page 26.
Inspect reed switch wiring.
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