Service Manual

15
1. Diagnostic Procedures
The diagnostic procedure is a sequence check that allows you to diagnose the electrical
system and components. Before proceeding, check for correct installation and proper
voltage per nameplate.
See the table for default cabinet temperature control dial settings.
Model Default Cabinet Temperature
Control Dial Setting
Approximate Default Temperature
UR/WR - Undercounter/Worktop 5 Refrigerator: 34°F (1°C)
SR - Prep Table 5 Refrigerator 34°F (1°C)
UF/WF - Undercounter/Worktop 7 Freezer: -5°F (-21°C)
The diagnostic procedure is a sequence check that allows you to diagnose the electrical
system and components. Before proceeding, check for correct installation and proper
voltage per nameplate.
Conrm that the appliance location meets factory requirements:
• This appliance is not intended for outdoor use. Normal operating ambient
temperature:
– All UR/WR and Solid Door UF/WF 45°F to 100°F (7°C to 38°C)
– SR 45°F to 86°F (7°C to 30°C)
– UF Glass Door 45°F to 80°F (7°C to 27°C).
• The appliance should not be located next to ovens, grills, or other high heat
producing equipment. Check CM using the steps in "II.C. Control Module Check."
Note: • When checking voltage (115VAC), always choose a neutral white (W) wire to
establish a good neutral connection.
• Control module has high and low voltage protection. If off on either protection,
no LED is visible and all components are off.
High Voltage: 140VAC
Low Voltage: 90VAC
• There is a 2 min. minimum compressor on time for all models and a
2-min. minimum compressor off time for UR/WR and SR and a 3-min. minimum
compressor off time for UF/WF.
• The control module incorporates LEDs
to identify sequence of operation.
Reference the table below to assist in
the diagnostic process.
CONTROL MODULE LED OPERATION
LEDs LED OPERATION
R Y G
X
X 5-SEC. DELAY
X X
SYSTEM ON
X X
CTh SATISFIED; SYSTEM OFF
X X
2-MIN. ON/OFF DELAY
X
DEFROST/DTh FAULT
SYSTEM OFF
X
CTh FAULT
LED OPERATION LEGEND
CYCLING
CTh - CABINET THERMISTOR
FLASHING
DTh - DEFROST THERMISTOR
ON
X OFF