Troubleshooting Flowcharts; Blank Display - Refrigerator Does Not Turn On - Norcold 1200 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 Vdc input to the power board is wired according to the 1200XX/120X-IMXX Installation Manual.
Fault indicator displayed:
ON
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 Ohms
Bad = OL
00.0
Figure 3. Checking the DC fuse continuity
Refrigerator Service Manual

TROUBLESHOOTING FLOWCHARTS

All LEDs off
Cold Coldest
TEMP
Blank
MODE
OFF SET Screen
AUTO AC LP GAS
Mode LED off
10.5
to
15.4 Vdc?
YES
F1 fuse okay?
YES
Voltage
present?
YES
F1 Fuse
Wire harness optical
control display connector
www.norcold.com/cda
Blank
Screen
on
1 COLD - 9 COLDEST SET
NO
1. No DC power input from RV to unit.
2. Faulty wiring or connectors.
NO
Replace fuse. Refer to
Specifications on page 4.
NO
Replace power board.
See page 40.
Replace optical control assembly.
See page 41.
Figure 4. Measurement points for wire harness voltage
TEMP MODE ON / OFF
White/violet wire
White/red wire
10.5 to 15.4 Vdc
87 III TRUE RMS MULTI METER
V
MIN MAX RANGE HOLD H
REL Hz
4 1/2 DIGITS PEAK MIN MAX
1 Seconds
mV
mA
V A
µA
V
OFF
A mA µA COM V
V
!
400mA MAX CAT II
FUSED
10A MAX 1000V MAX
!
FUSED
1200XX/120X-IMXX Models
9