Norcold N306 - Troubleshooting Test B: No DC Cooling

SERVICE MANUAL / MANUEL D’ENTRETIEN / MANUAL DE SERVICIO
33
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Troubleshooting Test B - Not cooling On DC
Troubleshooting, cont’d. Dépannage, suite Resolución de problemas (cont.)
1. Perform the “Diagnostic Pre-Checks.”
2. 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 diagram.
■ No: Go to the fl ow chart below.
Models
N304M.3,N404M.3,N504M.3
Refrigerator will not operate in DC
mode
Is mode selector switch in
the DC position?
Is DC power indicator light
on?
Turn mode
selector switch to
DC and start up.
No
Yes
Yes
Is DC voltage at input of
DC heater?
(Yellow Wires)
Replace heaterYes
Repair wiring/connections:
Yellow wire between selector
switch (terminal 4b) and heater
or
yellow heater wire connection
at terminal block terminal HC-
No
Is there 12 volts DC at
terminal block
(HC+ and HC- terminals)
No
Correct DC power
to refrigerator
No
Is there 12 volts DC at input of
fuse?
20A fuse (N304M.3) Red lead
25A fuse (N404M.3) Yellow lead
25A fuse (N504M.3) Yellow lead
Yes
Ensure red wire of
fuse is connected
to HC+ terminal
OR
Ensure yellow wire
of fuse is
connected to HC+
terminal
No
Is there 12 volts DC at
input of mode selector
switch?
(Terminal 4a, Red wire)
Is there 12 volts DC at output of
fuse?
20A fuse (N304M.3) Red lead
25A fuse (N404M.3) Yellow lead
25A fuse (N504M.3) Yellow lead
Yes
No
Replace fuse
Correct wiring/
connection
between fuse and
selector switch
(Red Wire)
No
Yes
Is there 12 volts DC at
output of mode selector
switch?
(Terminal 4b, Yellow wire)
Yes
Replace mode
selector switch
No
Is power indicator light
on?
Yes
Are indicator wires
properly connected per
wiring diagram?
No
Properly connect and or
repair wiring
No
Replace power
indicator light
Yes
Yes
Yes
Models
N305, N305.3, N306, and N306.3
Refrigerator will not operate in DC
mode
Is mode selector switch in
the DC position?
Is DC power indicator light
on?
Turn mode
selector switch to
DC and start up.
No
Yes
Yes
Is DC voltage at input of
DC heater?
(Yellow Wires)
Replace heaterYes
Repair wiring/connections:
Yellow wire between selector
switch (terminal 4b) and heater
or
yellow heater wire connection
at terminal block terminal HC-
No
Is there 12 volts DC at
terminal block
(HC+ and HC- terminals)
No
Correct DC power
to refrigerator
No
Is there 12 volts DC at input of
fuse?
20A fuse (N304M.3) Red wire
25A fuse (N404M.3) Yellow wire
25A fuse (N504M.3) Yellow wire
Yes
Ensure red wire of
fuse is connected
to HC+ terminal
OR
Ensure yellow wire
of fuse is
connected to HC+
terminal
No
Is there 12 volts DC at
input of mode selector
switch?
(Terminal 4a, Red wire)
Is there 12 volts DC at output of
fuse?
20A fuse (N304M.3) Red wire
25A fuse (N404M.3) Yellow wire
25A fuse (N504M.3) Yellow wire
Yes
No
Replace fuse
Correct wiring/
connection
between fuse and
selector switch
(Red Wire)
No
Yes
Is there 12 volts DC at
output of mode selector
switch?
(Terminal 4b, Yellow wire)
Yes
Replace mode
selector switch
No
Is power indicator light
on?
Yes
Are indicator wires
properly connected per
wiring diagram?
No
Properly connect and or
repair wiring
No
Replace power
indicator light
Yes
Yes
Yes
NOR000231A-1