ARB 35L - Page 14

Revision Date – 22/12/2014 page 13
TROUBLESHOOTING
DC Power Supply (continued)
Symptom
Possible Cause(s)
Suggested Action(s)
Fridge does not run when
using a 12/24V DC power
supply.
Interior light works.
Power LED is orange.
Fridge has reached cabinet
temperature and is
functioning correctly.
Reduce target cabinet temperature. Power
LED will change to green, compressor will
start and fridge will start cooling.
Faulty compressor control
unit.
Test compressor control unit (refer to
section 8.2). If compressor does not run
during test, replace control unit (refer to
section 9.3) and repeat test. If compressor
still fails to run, test compressor (refer to
section 8.5).
Faulty control panel circuit
board.
Test compressor control unit (refer to
section 8.2). If control unit is ok, test fridge
with new control panel circuit board and
replace is necessary (refer to section 9.1).
Faulty main circuit board.
Test compressor control unit (refer to
section 8.2). If control unit is ok, test fridge
with new main circuit board and replace if
necessary (refer to section 9.4).
Faulty thermistor.
Test compressor control unit (refer to
section 8.2). If control unit is ok, test fridge
with new thermistor and replace if
necessary (refer to section 9.22).
Fault within main wiring loom.
Test continuity of wiring loom from main
circuit board to control panel circuit board.
If fault identified and unrepairable, contact
ARB for advice.
Faulty compressor.
Test compressor (refer to section 8.5). If
compressor is faulty, contact a licensed
refrigeration mechanic for assistance.
NOTE: A faulty compressor is
extremely unlikely.
Fridge will not run when DC
input voltage exceeds 13.8V
(eg. When vehicle is
running).
Faulty main circuit board.
Replace main circuit board (refer to section
9.4) and retest.