Sub-Zero 700TC-3 Service Manual page 104

Troubleshooting Guides
PROBLEM
(Continued)
H. Warm Freezer Temperatures
without "SERVICE" Flashing
Pointers:
1. "Sr" appears during Diagnostic
Mode, see:
• Unit in Showroom Mode
2. 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
3. Evap Temp between -19°F
(-28°C) and 0°F (-17°C), see:
• Warm food load
• High room ambient
• Door ajar
• Condenser Air Flow
• Compartment thermistor mis-
read
• Sealed system fault: leak
4. 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 non-flashing
SERVICE indicator after repairs,
press door ajar alarm bell
ON/OFF key for 15 seconds.
#3758412 - Revision B - December, 2006
Integrated
Integrated
POSSIBLE CAUSE
Evaporator Fan Fault
a. Top hinge cover missing, not depress-
ing 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 or 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
NOTE: For 700TF/I-3, see Error Code
Troubleshooting Guide
Sealed System Fault
• Sealed System Leak
• Sealed System Restriction
• Inefficient Compressor
8-10
3
3 Series
Series
(700- T ALL)
(700- T ALL)
TEST / ACTION
a. Replace hinge cover.
b. Move obstruction or reposition blade.
c. Check for 115V AC to fan switch, depress
fan switch and check for 115V AC from fan
switch. Replace switch if defective. (NOTE:
there are two fan switches in the drawer
area)
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 freezer compartment
thermistor for 30,000 to 33,000 ohms at
32°F (0°C). Replace if defective.
a. See Door or Drawer Ajar on previous page.
b. See Evaporator Fan Fault above.
c. See Compartment 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 bad connections or replace terminator
if defective.
f. Manually initiate defrost by pressing ICE key
for 10 seconds. If defrost lasts exactly 5
minutes, 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 10 seconds. Check for 115V AC at E2 on
control board. Replace control board if
defective.
Check for 115V AC at E7 on control board.
Replace control board if defective.
See Sealed System Troubleshooting Guide