Troubleshooting Test B - Not Cooling On Dc; Perform The "Diagnostic Pre-Checks - Norcold N180.3 Service Manual

Troubleshooting, cont'd.

Troubleshooting Test B - Not cooling on DC

Perform the "Diagnostic Pre-Checks."

1. Remove unit from enclosure, leaving DC power connected.
Have any wires become disconnected from their terminals?
■ Yes: Reattach wires and test unit; refer to the wiring dia-
gram.
■ No: Go to the flow chart below.
Correct DC power
to refrigerator
No
Is there 12 volts DC at
terminal block?
(HC+ and HC- terminals)
Yes
Is there 12 volts DC at input of fuse?
Yes
Is there 12 volts DC at output of fuse?
Yes
Is there 12 volts DC at
input of mode selector
switch?
(Terminal 4a, Red wire)
Yes
Is there 12 volts DC at
output of mode selector
switch?
(Terminal 4b, Yellow wire)
Yes
Is power indicator light
on?
No
Are indicator wires
properly connected per
wiring diagram?
No
Properly connect and or
repair wiring
N180.3
Refrigerator will not operate in DC mode.
Is mode selector switch in
the DC position?
Is DC power indicator light
No
Ensure red wire of
fuse is connected
to HC+ terminal
No
OR
Ensure yellow wire
of fuse is
connected to HC+
terminal
Replace fuse
No
Correct wiring/
connection
No between fuse and
selector switch
(Red wire)
Replace mode
No
selector switch
Replace power
Yes
indicator light
Turn mode
No selector switch to
DC and start up.
Yes
Yes
on?
Is DC voltage at input of
Yes
Yes
14
DC heater? Yes
(Yellow wires)
Repair wiring/connections:
Yellow wire between selector
No
switch (terminal 4b) and heater
or
yellow heater wire connection
at terminal block terminal HC-
Replace heater
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