Sub-Zero 400 Series Service & Parts Manual

TROUBLESHOOTING GUIDE
5-6
Lighting inoperative
(continued).
Lighting ON with doors and
drawers shut. Door alarm
keeps beeping.
Display problems:
1. “--” on LCD.
2. “-20” on LCD and
indicator flashing.
3. “55” on LCD and
indicator flashing.
4. “Su” on LCD and top
lights off.
5. “-88” on LCD, top lights
off and keys inoperative.
6. Top lights off and keys
inoperative.
2. Transformer secondary winding
faulty (continued).
Control board faulty.
Faulty door sensor/reed switch.
1. Faulty door sensor (700TR,
700TC/I, 700TF/I only), or faulty
reed switch (all models).
1. Control is shut off.
2. Zone thermistor malfunction.
NOTE: If a thermistor is
unplugged or replaced, the unit
must be turned OFF at the master
power switch, then turned back
ON to clear the error mode.
3. Zone thermistor malfunction.
NOTE: If a thermistor is
unplugged or replaced, the unit
must be turned OFF at the master
power switch, then turned back
ON to clear the error mode.
4. Blue wire of display cable is
unhooked or faulty.
5. Red wire of display cable is
unhooked or faulty.
6. Black, white, or yellow wire of dis-
play cable is unhooked or faulty.
2. 700BR, 700BF/I only. Check the trans-
former secondary winding for 15VAC at
any light socket. If no 15VAC, repair
wiring or replace transformer.
Check for 115V across P6 & P5 at control
board. If no 115V, check wiring to unit and
to control board. Repair if faulty.
1. With door shut and reed switches
depressed, check for 115V across P7 &
P5 at control board. If 115V is present,
repair wiring at door sensor or reed
switch, or replace door sensor or reed
switch.
1. Unit is OFF. Press COLDER key to
start unit.
2. Thermistor in indicated zone is
unplugged or faulty. Repair wiring or
replace thermistor.
NOTE: Resistance of thermistor should be
approximately 32500 ohms at 32
o
F, 10000
ohms at 77
o
F.
3. Thermistor in indicated zone is shorted.
Repair wiring or replace thermistor.
4. Repair wiring.
5. Repair wiring.
6. Repair wiring.
Complaint Possible Cause Correction
GENERAL TROUBLESHOOTING GUIDE
CAUTION! Low volt-
age. DO NOT apply 115
volts.
CAUTION! Low voltage.
DO NOT apply 115 volts.
CAUTION! Low volt-
age. DO NOT apply 115
volts.
CAUTION! Low voltage.
DO NOT apply 115 volts.

Sub-Zero 400 Series Specifications

General

Brand	Sub-Zero
Model	400 Series
Category	Refrigerator
Language	English