– 37 –Caution: When assembling the top panel, use care to prevent pinched wires.
Troubleshooting
Use this diagnostic flowchart if the Climate Control Drawer control panel and display are not operating
properly.
If the problem is drawer temperature and the control panel and display appear to be operating normally,
check the thermistor, damper, fan, and heater first.
If the actual drawer temperature displayed is incorrect, suspect the thermistor and main control board.
ORANGE
9-Pin Connector
Behind Climate
Control Drawer
Check
communication
using diagnostic
mode.
Communication
pass?
Disconnect connector J4
from main control board.
Check for 12 VDC at
main control board
between J4-2 and J4-3.
12 VDC present?
YES
Replace main
control board.
NO
Open wiring between Climate
Control Drawer control board and
main control board.
NO
Replace Climate
Control Drawer
control board.
YES
NO
Disconnect connector from Climate
Control Drawer control board.
Check for 12 VDC at the Climate
Control Drawer control board
connector between terminals 3 and 5.
12 VDC present?
Replace Climate
Control Drawer control
board. If problem is not
corrected, replace the
main control board.
YES
Is a temperature or time
displayed or are any
indicator lights illuminated
on the Climate Control
Drawer control panel?
No display
or lights
Display and/or lights
Check for continuity on
data circuit between
J4-1 and Climate Control
Drawer control board
connector terminal 5.
Circuit OK?
YES
Repair circuit.
NO
Replace Climate
Control Drawer
control board.
Reconnect connector J4 to
main control board.
Check for 12 VDC at J4-2 at
main control board between
J4-2 and J4-3.
12 VDC present?
Replace Climate
Control Drawer
control board.
NO
YES