Sub-Zero UC-24 series Service Manual page 40

Troubleshooting Guides
HOW TO USE THE GENERAL TROUBLESHOOTING GUIDE
• The table on page 8-7 indicate how the General Trouble Shooting Guide is arranged.
• Identify the description of the problem that the unit is experiencing from the table.
• To the left of the problem description is a letter.
• Locate that letter in the left column of the General Troubleshooting Guide.
• The center column will identify the possible causes for the problem.
• The information in the right column explains the tests to perform and/or action to take to correct the problem.
• If the unit is experiencing temperature problems, refer to the instructions below before beginning troubleshooting.
For Temperature Problems
1. Begin troubleshooting by observing compartment set points.
2. If set-points are normal, initiate Diagnostic Mode by pressing and holding either COLDER key, then press
POWER key, then release both keys.
NOTE: Diagnostic Mode will end twenty (20) seconds after last key stroke.
3. When Diagnostic Mode is initiated, check to see if "Error Codes" are present, being sure to toggle through all
error codes and temperature readings by pressing either COLDER key, or either WARMER key. (See
Thermistor Location Code Tables below.)
4. If Error Codes are present, refer to Error Code Troubleshooting Guide, which starts on page 8-2.
5. If no Error Codes are observed, see General Troubleshooting Guide Table of Contents on following page.
NOTE: If compartment and/or evaporator temperature history is needed to help diagnose problem, initiate
Temperature Log Recall Mode. Begin with unit ON and in Diagnostic Mode. While in Diagnostic Mode, toggle
through readings until desired thermistor temperature is displayed on LCD. Now, press POWER key then either
WARMER key simultaneously. Toggle through indexes by pressing WARMER or COLDER key.
Model UC-24B
THERMISTOR LOCATION
Beverage Compartment
Evaporator
#7003933 - Revision B - November, 2007
Under Counter (UC-24) Series
THERMISTOR LOCATION CODE TABLES
Model UC-24C
CODE THERMISTOR LOCATION
r Freezer Compartment
E Refrigerator Compartment
CODE
F Refrigerator Compartment
r
Evaporator E
8-6
Models UC-24R, UC-24RO
THERMISTOR LOCATION
Evaporator
CODE
r
E