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Troubleshooting Guides
PROBLEM
(Continued)
G. Warm Freezer Temperature
with "SERVICE" Flashing
Pointers:
1. Evap Temp -20°F (-29°C) or
lower, see:
• Door ajar
• Lights ON w/door closed
• Evaporator fan fault
• Compartment thermistor mis-
read
• Evaporator heavily frosted
• Sealed system fault: leak or
partial restriction
2. Evap Temp between -19°F
(-28°C) and 0°F (-17°C), see:
• Condenser Air Flow
• Compartment thermistor mis-
read
• Sealed system fault: leak
3. Evaporator Temp 0°F (-17°C)
or higher, see:
• Power to compressor fault
• Sealed system Fault: leak,
restriction, inefficient compres-
sor
NOTE: "Pointers" do not apply to
cabinet initial pulldown from
ambient temperatures.
NOTE: To clear flashing SER-
VICE indicator after repairs,
power OFF, then back ON.
NOTE: To clear non-flashing
SERVICE indicator after repairs,
press door ajar alarm bell
ON/OFF key for 15 seconds.
#3758407 - Revision B - August, 2006
Built-In
Built-In
POSSIBLE CAUSE
Light ON with Door Closed
a. Switch depressor missing or bent, not
depressing light switch
b. Faulty light switch
Evaporator Fan Fault
a. Switch depressor missing or bent, not
depressing fan switch
b. Fan blade obstructed or out of position
c. Faulty fan switch
(NOTE: A compressor must be running)
d. Evaporator fan motor disconnected
e. Evaporator fan motor defective
(NOTE: Compressor must be running)
Compartment Thermistor Misread
Evaporator Heavily Frosted
a. Door ajar
b. Evaporator fan fault
c. Compartment thermistor misread
d. Defrost heater or drain trough 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
Series
Series
2
2
(600-
)
(600-
)
a. Replace/straighten switch depressor.
b. Check operation of light switches, lights off
when switch is depressed. Replace switch if
defective.
a. Replace/straighten switch depressor.
b. Move obstruction or reposition blade.
c. Check for 115V AC to fan switch, depress
fan switch and check for 115V AC from
switch to motor. Replace switch if defective.
d. Check electrical connections of motor.
Reconnect / repair bad connections.
e. Check for 115V AC at fan motor with fan
switch depressed. Replace motor if defec-
tive.
Check resistance of compartment thermistor
for 30,000 to 33,000 ohms at 32°F (0°C).
Replace if defective.
a. See Door Ajar on previous page.
b. See Evaporator Fan Fault on previous page.
c. See Compartment Thermistor Misread on
previous page.
d. Check electrical connections of heaters.
Reconnect / repair bad connections. Check
resistance of heaters, replace if defective.
e. Check electrical connections, Reconnect /
repair bad connections or replace terminator
if defective.
f. Look for Error Codes 20, 22 or 23 or
Manually initiate defrost by pressing ICE key
for 5 seconds. If defrost lasts exactly 5 min-
utes, check all connections of gray/white
wire from terminator to J4-4 on control
board. Reconnect / repair bad connections.
g. Manually initiate defrost by pressing ICE key
for 5 seconds. Check for 115V AC at E2 on
control board. Replace control board if
defective.
Initiate Manual Component Activation Mode
and check for 115V AC at E7 on control
board. Replace control board if defective.
See Sealed System Diagnostic Tables at
back of Troubleshooting Guide
8-8
TEST / ACTION
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