Troubleshooting Flowcharts; Blank Display - Refrigerator Does Not Turn On - Norcold N109X Series Service Manual

blank Display – Refrigerator does not turn on
Before beginning this procedure make sure:
The RV DC power system is supplying 10.5 to 15.4 volts to the refrigerator.
■
No other RV appliances or lighting circuits are connected to the refrigerator dc circuit.
■
12 volt DC input to the power board is wired according to the N109X Installation Manual.
■
Fault indicator displayed:
Measure voltage across
power board 12VDC and
GND1 connections .
Check condition of F1 fuse
in power board. See Figure 3.
Measure voltage at optical
control harness. See
Figure 4.
Good= 00.0 W
Bad = OL
00.0
figure 3. Checking the dc fuse
continuity
8
N109X Models

tROubLEShOOtING fLOwChaRtS

10.5 to
15.4 volts DC?
YES
F1 fuse okay?
YES
Voltage
present?
YES
F1 Fuse
Wire harness optical
control display connector
1-COLD COLDEST-9
MODE
ON TEMP ON-OFF
SET
NO
1. Low/no DC power input to power board.
2. Loose/faulty wiring or connectors.
NO
Replace fuse. Use a standard 5 amp
(tan color) automotive blade style fuse.
NO
Replace power board.
See page 38.
Replace optical control assembly.
See page 39.
figure 4. Measurement points for wire harness voltage
White/violet wire
White/red wire
10.5 to 15.4 volts DC
87 III
V
V
Refrigerator Service Manual