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Turn on Express Chill.
Check for 12 VDC at
main control board
between J2-8 and J2-7.
12 VDC present?
Check communication
using diagnostic mode.
Communication pass?
NO
Replace main
control board.
YES
· Open circuit between J4-1 and
Climate Control Drawer control
board terminal 1.
· Faulty Climate Control drawer
control board.
· Faulty main control board.
NO
Check for 12 VDC
at fan connector.
12 VDC present?
YES
Open circuit
between main
control board and
fan connector.
NO
YES
· Open circuit between
fan connector and fan.
· Faulty fan.
Fan and Fan Housing
The 12 VDC fan is controlled by the main control board. The main control board turns the fan on and off
based on input from the Climate Control Drawer control board and thermistor. The fan should always
come on any time Express Chill or Express Thaw is selected.
Troubleshooting
Removal
1. Remove Climate Control Drawer top panel.
2. Loosen 2 bottom screws, remove 2 top
screws, and remove air diffuser from fan
housing.
J4 or J16
J3 or J10
J1 or J14
J2 OR J13
Some of the low voltage DC
connector labeling on this model
may differ from other models. The
function and diagnostics for these
connectors are identical for all
models.
Screws (Remove)
Screws (Loosen)
Flat Surface
Tabs
Air
Diffuser
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