Sub-Zero 700-2 Series

Page 135
Troubleshooting Guides
Integrated (
Integrated (
700-
700-
2) Series
2) Series
8-29
#3756780 - Revision D - July, 2005
PROBLEM POSSIBLE CAUSE TEST / ACTION
PP. Membrane Switch on
Control Board Malfunction
QQ. No Lighting
RR. Lights Stay on When
Drawers Are Closed (May be
Accompanied by Drawer Ajar
Alarm Bell)
SS. Drawer Not Able to Close
Completely
Control Cable Disconnected or
Defective
Control Panel Assembly Defective (OR)
No Signal Read at Control Board
No power to unit
Unit switched OFF
Unit in Sabbath Mode
Defective or loose light bulb(s)
Reed Switch Disconnected or Defective
Lighting System Wiring Disconnected or
Defective
No Power From Control Board
(NOTE: See Unit in Sabbath Mode above.)
Drawer Ajar
a. Food product obstruction
b. Drawer closer tripped backwards
Reed Switch Defective
Drawer closer tripped backwards
Check control cable from control panel to
display board. Check all pins on Methode
Connector at back air duct. Reconnect /
repair connections.
See Membrane Switch/Ribbon Cable Test
Procedures. If membrane switch passes all
tests in Membrane Switch/Ribbon Cable
Test Procedures, replace control board.
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.
Install a known good light bulb.
Check wire connections at Reed Switch.
Reconnect/repair. Check for 24V AC to and
from Reed Switch. Replace switch if defec-
tive.
Check for 115V AC from light sockets back
to P2 on control board. Reconnect/repair or
replace defective components.
Check for 115V AC at P2 on control board.
Replace board if defective.
(NOTE: See Unit in Sabbath Mode above.)
a. Move obstruction.
b. Trip drawer closer forward
Check wire connections at Reed Switch.
Reconnect/repair. Check for 24V AC to and
from Reed Switch. Replace switch if defec-
tive.
Trip drawer closer forward
Low Voltage Circuit.
Do NOT apply 115V AC.
Low Voltage Circuit.
Do NOT apply 115V AC.