Troubleshooting Test A - Not Cooling On Ac - Norcold N180.3 Service Manual

Troubleshooting, cont'd.

Troubleshooting Test A - Not Cooling on AC

1. Perform the "Diagnostic Pre-Checks."
2. Remove unit from enclosure, leaving AC 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 AC power Correct AC power
to refrigerator to refrigerator
No No
Is there 120 VAC at terminal block? Is there 240 VAC at terminal block
Black wire = 120 volt line Brown wire = 240 volt line
Blue Wire = 240 volt neutral Black Wire (ribbed)= 120 volt neutral
Yes Yes
Is there 120 VAC at input Is there 240 VAC at input
to 3A AC Heater Fuse? to 3A AC Heater Fuse?
(Black wire) (Black lead)
Yes Yes
Is there 120 VAC at output Is there 240 VAC at output
of 3A AC Heater Fuse? of 3A AC Heater Fuse?
(Black lead) (Black wire)
Yes Yes
Is there 240 VAC at Is there 120 VAC at
input to mode selector input to mode selector
switch, Terminal 1a? switch, Terminal 1a?
(Black wire) (Black wire)
Yes Yes
Is there 240 VAC at Is there 120 VAC at
output of mode selector output of mode selector
switch, Terminal 1b? switch, Terminal 1b?
(Black wire) (Black 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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No No
Ensure black Ensure black
wire of 3A Fuse wire of 3A Fuse
No No
is connected to is connected to
terminal block terminal block
with black wire with brown wire
from AC cord from AC cord
No No
Replace fuse Replace fuse
Correct wiring/ Correct wiring/
connection connection
No No between fuse and between fuse and
selector switch selector switch
(Black Wire) (Black wire)
Replace mode Replace mode
No No
selector switch selector switch
Replace power Replace power
Yes Yes
indicator light indicator light
Refrigerator will not operate in
Refrigerator will not operate in
AC mode AC mode
Is mode selector switch in Is mode selector switch in
the AC position? the AC position?
Yes Yes
Is AC thermostat set to Is AC thermostat set to
mid-range or higher? mid-range or higher?
Yes Yes
Is AC power indicator Is AC power indicator
light on? light on?
Yes Yes
Is 240 VAC at input of AC Is 120 VAC at input of AC
heater? heater?
(Black wires) (Black Wires)
No No
Is 120 VAC at input to AC Is 240 VAC at input to AC
thermostat? thermostat?
(Terminal 4, Black wire) (Terminal 4, Black wire)
Yes Yes
Yes Yes
Is 120 VAC at output of Is 240 VAC at output of
Yes Yes
AC thermostat? AC thermostat?
(Terminal 3, Blue/White wire) (Terminal 3, Blue/White wire)
13
Turn mode selector Turn mode selector
No No
switch to AC and start up switch to AC and start up
Set AC thermostat to Set AC thermostat to
No No
mid-range or higher mid-range or higher
Yes Yes Replace AC heater Replace AC heater
Correct wiring/ Correct wiring/
connection between connection between
mode selector switch mode selector switch
No No
terminal 1b and AC terminal 1b and AC
thermostat terminal 4 thermostat terminal 4
(Black wire) (Black Wire)
Replace AC Replace AC
No No
thermostat thermostat
SERVICE MANUAL