Sub-Zero 700-3 BASE, Technical & Service Manual

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Troubleshooting Guides
Integrated
(700-
3
BASE)
Series
8-11
#3758424 - Revision B - December, 2005
PROBLEM POSSIBLE CAUSE TEST / ACTION
(Continued)
G.) Warm Freezer Temperatures,
“SERVICE” not displayed or
Flashing
Pointers:
Compressor must be ON & unit
not defrosting, then initiate
Diagnostic Mode to observe
evaporator temperature.
1. “Sr” appears, see:
• Unit in Showroom Mode
2. “EC” appears, see:
• Error Code Troubleshooting
Guide
3. Evaporator temp. -20°F (-
29°C) or lower, see:
• Drawer ajar
• Lights switch fault
• Evaporator fan fault
• Compartment thermistor mis-
read
• Evaporator heavily frosted
• Sealed system fault - leak or
partial restriction
4. Evaporator. Temp. between -
19°F (-28°C) & 10°F (-12°C),
see:
• Warm food load
• High room ambient
• Drawer ajar
• Condenser Air Flow
• Compartment thermistor mis-
read
• Sealed system fault, leak
5. Evaporator. Temp. 20°F (-
29°C) or higher, see:
• Power To Compressor fault
• Sealed system fault, leak
restriction or inefficient com-
pressor
( NOTE: “Pointers” do not apply to
cabinet initial pulldown from
ambient temperatures.)
Evaporator Heavily Frosted
a. Drawer 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
a. See Drawer 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 115V AC at control
board. Replace control board if defective.
Check for 115V AC at control board.
Replace control board if defective.
See Sealed System Troubleshooting Guide