Troubleshooting Test B - Not Cooling On Dc - Norcold N305 Service Manual

Troubleshooting, cont'd.

Troubleshooting Test B - Not cooling On DC

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.
Correct DC power Correct DC power
to refrigerator to refrigerator
No No
Is there 12 volts DC at Is there 12 volts DC at
terminal block terminal block
(HC+ and HC- terminals) (HC+ and HC- terminals)
Yes Yes
Is there 12 volts DC at input of Is there 12 volts DC at input of
fuse? fuse?
20A fuse (N304M.3) Red wire 20A fuse (N304M.3) Red lead
25A fuse (N404M.3) Yellow wire 25A fuse (N404M.3) Yellow lead
25A fuse (N504M.3) Yellow wire 25A fuse (N504M.3) Yellow lead
Yes Yes
Is there 12 volts DC at output of Is there 12 volts DC at output of
fuse? fuse?
20A fuse (N304M.3) Red lead 20A fuse (N304M.3) Red wire
25A fuse (N404M.3) Yellow wire 25A fuse (N404M.3) Yellow lead
25A fuse (N504M.3) Yellow lead 25A fuse (N504M.3) Yellow wire
Yes Yes
Is there 12 volts DC at Is there 12 volts DC at
input of mode selector input of mode selector
switch? switch?
(Terminal 4a, Red wire) (Terminal 4a, Red wire)
Yes Yes
Is there 12 volts DC at Is there 12 volts DC at
output of mode selector output of mode selector
switch? switch?
(Terminal 4b, Yellow wire) (Terminal 4b, Yellow wire)
Yes Yes
Is power indicator light Is power indicator light
on? on?
No No
Are indicator wires Are indicator wires
properly connected per properly connected per
wiring diagram? wiring diagram?
No No
Properly connect and or Properly connect and or
repair wiring repair wiring
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Models Models
N304M.3,N404M.3,N504M.3 N305, N305.3, N306, and N306.3
Refrigerator will not operate in DC Refrigerator will not operate in DC
Is mode selector switch in Is mode selector switch in
the DC position? the DC position?
Is DC power indicator light Is DC power indicator light
No No
Ensure red wire of Ensure red wire of
fuse is connected fuse is connected
to HC+ terminal to HC+ terminal
No No
OR OR
Ensure yellow wire Ensure yellow wire
of fuse is of fuse is
connected to HC+ connected to HC+
terminal terminal
Replace fuse Replace fuse
No No
Correct wiring/ Correct wiring/
connection connection
No No between fuse and between fuse and
selector switch selector switch
(Red Wire) (Red Wire)
Replace mode Replace mode
No No
selector switch selector switch
Replace power Replace power
Yes Yes
indicator light indicator light
mode mode
Turn mode Turn mode
No No selector switch to selector switch to
DC and start up. DC and start up.
Yes Yes
on? on?
Is DC voltage at input of Is DC voltage at input of
Yes Yes
Yes Yes
SERVICE MANUAL / MANUEL D'ENTRETIEN / MANUAL DE SERVICIO
33
Resolución de problemas (cont.)
Yes Yes
DC heater? DC heater? Yes Yes
(Yellow Wires) (Yellow Wires)
Repair wiring/connections: Repair wiring/connections:
Yellow wire between selector Yellow wire between selector
No No
switch (terminal 4b) and heater switch (terminal 4b) and heater
or or
yellow heater wire connection yellow heater wire connection
at terminal block terminal HC- at terminal block terminal HC-
Replace heater Replace heater