Warm Refrigerator Temperatures, "Service" Not Displayed Or Flashing; Product Temperature 10° Or More Colder Than Displayed Temperature; 1. "Extremely" Cold Temperatures Displayed 1° To 7° In Refrigerator; If Outside Us - "Extremely" Warm Temperatures Displayed (34° To 45° In Refrigerator) No Lcd - Wolf Sub-Zero ICB400 Series Service Manual

TroubleShoot Guide
PROBLEM
(Continued)
T. Warm Refrigerator
Temperatures, "SERVICE"
not displayed or Flashing
U. Product Temperature 10° or
More Colder than Displayed
Temperature
V. 1. "Extremely" Cold
Temperatures Displayed
• 1° to 7° in Refrigerator
2. If outside US -
"Extremely" Warm
Temperatures Displayed
• 34° to 45° in Refrigerator
W. No LCD
7011544 - Revision A - November, 2008
International W
International W
POSSIBLE CAUSE
Refrigerator Compartment Fan Fault
a. Fan blade obstructed or out of position
b. Evaporator fan motor disconnected
c. Power to Fan Fault, or Fan Motor
Defective
Compartment Thermistor Disconnected,
Shorted, or misread
Compartment Thermistor Misread
1. Control Set to Display Celsius
2. If Outside US - Control Set to Display
Fahrenheit
Unit in Sabbath Mode
Display Wire Harness Disconnected or
Faulty
Control Panel Assembly Defective (OR)
No Signal Read at Control Board
7-16
ine Storage
ine Storage
(ICB400)
(ICB400)
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
230V AC from control board to fan motor.
Replace control board if defective, or
Replace motor if defective.
Check refrigerator evaporator thermistor
electrical connections from thermistor to
control board. Reconnect / repair connec-
tions. Check resistance of refrigerator evap-
orator thermistor for 30,000 to 33,000 ohms
at 0°C (32°F). Replace if defective.
Check resistance of compartment thermistor
for 30,000 to 33,000 ohms at 0°C / 32°F.
Replace if defective.
1. Change temperature units of measure to
Fahrenheit. Switch unit OFF, then ON, then
press & hold Bell key and POWER key for
10 seconds.
2. If Outside US - Change temperature units of
measure to Celsius. Switch unit OFF, then
ON, then press & hold Bell key and
POWER key for 10 seconds.
Exit Sabbath Mode, press POWER key.
Check display wire harness and connec-
tions, including wires behind refrigerator
duct cover. Reconnect, repair, replace bad
wiring.
See Membrane Switch/Ribbon Cable Test
Procedures.
test, replace entire control panel assembly.
If switch passes all tests, replace control
board.
Series
Series
TEST / ACTION
If membrane switch fails any