u-line.com
29
Troubleshooting
Fault System Diagnosis Guide
Error
Solution 1
Solution 2
Solution 3
No Comm
Inspect Customer UI and Data Cable
(if defective replace entire door)
(L) (R) Zone T Open
Inspect zone thermistor connection.
Replace if necessary.
Inspect main control wire harness for
splits or breaks. Repair split or cut
cabling.
(L) (R) 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.
(L) (R) 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.
(L) (R) 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.
(L) (R) 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 Refrigeration System
Diagnosis Guide on page
28
.
(L) (R) 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 Refrigeration System
Diagnosis Guide on page
28
.
(L) (R) Temp Lo 6H+
Inspect main control for proper relay
operation.
Inspect refrigeration system.
Reference the Refrigeration System
Diagnosis Guide on page
28
.
(L) (R) Temp Lo 12H+
Inspect main control for proper relay
operation.
Inspect refrigeration system.
Reference the Refrigeration System
Diagnosis Guide on page
28
.
(L) (R) Door Open 5M
Verify door closes properly.
Inspect cable arm, verify presence of
magnet, verify proper operation and
movement of arm.
Inspect reed switch wiring.
