USER GUIDE
Troubleshooting - Extended 3
u-line.com
SAFETY • INSTALLATION & INTEGRATION • OPERATING INSTRUCTIONS • MAINTENANCE •
SERVICE
FAULT SYSTEM DIAGNOSIS GUIDE
Error
Solution 1
Solution 2
Solution 3
No Comm
Inspect Customer UI and Data
Cable (if defective replace entire
door)
Zone T Open
Inspect zone thermistor
connection. Replace if necessary.
Inspect main control wire harness
for splits or breaks. Repair split or
cut cabling.
Evap T Open
Inspect evaporator thermistor
connection. Replace if necessary.
Inspect main control wire harness
for splits or breaks. Repair split or
cut cabling.
Amb Thrm Open
Inspect ambient thermistor
connection. Replace if necessary.
Inspect main control wire harness
for splits or breaks. Repair split or
cut cabling.
Zone T Short
Inspect thermistor cable for
pinch points or damage. Replace
if necessary.
Inspect wire harness from main
control board for pinch points or
damage. Repair split or pinched
cabling.
Evap T Short
Inspect thermistor cable for
pinch points or damage. Replace
if necessary.
Inspect wire harness from main
control board for pinch points or
damage. Repair split or pinched
cabling.
Amb Thrm Short
Inspect thermistor cable for
pinch points or damage. Replace
if necessary.
Inspect wire harness from main
control board for pinch points or
damage. Repair split or pinched
cabling.
Temp Hi 6H+
If excessive frost is also noted,
inspect door and door gasket for
proper seal and alignment.
Inspect evaporator fan for proper
operation.
Inspect refrigeration system.
Reference the System Diagnosis
Guide.
Temp Hi 12H+
If excessive frost is also noted,
inspect door and door gasket for
proper seal and alignment.
Inspect evaporator fan for proper
operation.
Inspect refrigeration system.
Reference the System Diagnosis
Guide.
Temp Lo 6H+
Inspect main control for proper
relay operation.
Inspect refrigeration system.
Reference the System Diagnosis
Guide.
Temp Lo 12H+
Inspect main control for proper
relay operation.
Inspect refrigeration system.
Reference the System Diagnosis
Guide.
Door Open 5M
Verify door closes properly.
Inspect cable arm, verify presence
of magnet, verify proper operation
and movement or arm.
Inspect reed switch wiring.
