Sub-Zero UC-24 series User Manual

Troubleshooting Guides
Under Counter (UC-24) Series
8-11
#7003933 - Revision B - November, 2007
PROBLEM POSSIBLE CAUSE TEST / ACTION
(Continued)
H. Warm Freezer Temperatures,
“SERVICE” not
displayed or
Flashing
I. Product Temperature 10° or
More Colder than Displayed
Temperature
J. 1. “Extremely” Cold
Temperatures Displayed
• 1° to 7° in Refrigerator
• -21° to -15° in Freezer
2. If outside US -
“Extremely” Warm
Temperatures Displayed
• 34° to 45° in Refrigerator
• -5° to 5° in Freezer
Evaporator Heavily Frosted
a. Door ajar
b. Evaporator fan fault
c. Compartment thermistor misread
d. Defrost heater disconnected or faulty
e. Defrost terminator disconnected or
faulty.
f. Defrost sense line disconnected.
g. No power from control board to defrost
circuit
Power to Compressor Fault
Sealed System Fault
• Sealed System Leak
• Sealed System Restriction
• Inefficient Compressor
Compartment Thermistor Misread
1. Control Set to Display Celsius
2. If Outside US - Control Set to Display
Fahrenheit
a. See Door Ajar above.
b. See Evaporator Fan Fault above.
c. See Thermistor Misread above
d. Check electrical connections. Reconnect /
repair bad connections. Check resistance of
heater, 30-38 Ohms, replace if defective.
e. Check electrical connections, Reconnect /
repair connections or replace bad terminator.
f. Manually initiate defrost - press ICE key for
10 seconds. If defrost lasts exactly 5 min-
utes, check all connections of gray/white
wire from terminator to control board.
Reconnect / repair bad connections.
g. Manually initiate defrost - Press ICE key for
10 seconds. Check for AC Voltage at control
board. Replace control board if defective.
Check for AC Voltage at control board.
Replace control board if defective.
See Sealed System Troubleshooting Guide
Check resistance of compartment thermistor
for 30,000 to 33,000 ohms at 32°F (0°C).
Replace if defective.
1. Change temperature units of measure to
Fahrenheit.
2. If Outside US - Change temperature units of
measure to Celsius.

Sub-Zero UC-24 series Specifications

General

Brand	Sub-Zero
Model	UC-24 series
Category	Refrigerator
Language	English