Warm Freezer Temperatures, "Service" Not Displayed Or Flashing - Sub-Zero 700-3 BASE Technical & Service Manual

Troubleshooting Guides
PROBLEM
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. Evap. 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. Evap. 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.)
(Continued)
#3758424 - Revision B - December, 2005
Integrated
POSSIBLE CAUSE
No Power to Unit
Unit Switched OFF
Unit in Show Room Mode
Control Set Too High
Warm Food Load
High Room Ambient
Drawer Ajar
a. Food product obstruction
b. Drawer closer tripped backwards
Condenser Air Flow
a. Dirty condenser
b. Condenser fan blade obstructed or
loose
c. Condenser fan motor disconnected
d. Condenser fan motor defective
Faulty Light Switch
Evaporator Fan Fault
a. Fan blade obstructed or out of position
b. Evaporator fan motor disconnected
c. Power to Fan Fault, or Fan Motor
Defective
(NOTE: Compressor must be running)
Compartment Thermistor Misread
8-10
3 Series
(700- BASE)
TEST / ACTION
Check power to unit, plug unit in or switch
supply circuit breaker ON.
Check for "OFF" displayed at LCD. If off,
press UNIT ON/OFF key.
Press UNIT ON/OFF key to OFF, then press
and hold WARMER& COLDER keys, and
press UNIT ON/OFF key.
Check set-point. If high, adjust.
Check contents of freezer for warm food
load. Instruct customer.
Instruct customer unit performs best
between 60°F(16°C) and 90°F(32°C).
a. Move obstruction.
b. Trip drawer closer forward
a. Clean condenser.
b. Remove obstruction or tighten blade.
c. Check continuity from motor to compressor.
Reconnect / repair wiring or connections.
d. Check for 115V AC to motor, replace if
defective.
Check operation of light switches, lights off
when switch is depressed. Replace switch if
defective. (NOTE: Two light switches in unit)
a. Move obstruction or reposition blade.
b. Check electrical connections & continuity
from control board to motor. Reconnect /
repair bad connections.
c. With light switches depressed, check for
115V AC from control board to fan motor.
Replace control board if defective, or
Replace motor if defective.
Check resistance of freezer compartment
thermistor for 30,000 to 33,000 ohms at
32°F. Replace if defective.