Revision Date – 15/07/2020
page 21
7.2 Fridge will not run on 12/24V DC power
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FRIDGE DOES NOT OPERATE ON DC POWER
DOES THE INTERIOR
LIGHT WORK WITH
FRIDGE TURNED ON?
CHECK LED
IS THE LED
GLOBE
BLOWN?
REPLACE LIGHT GLOBE
IS THE
POWER LED
GREEN?
IS THE DIGITAL
DISPLAY
VISIBLE?
TURN FRIDGE ON
IS THE ERROR
LIGHT FLASHING
ONCE EVERY 4
SECONDS?
TEST COMPRESSOR CONTROL UNIT
TEST WITH NEW CONTROL PANEL
CIRCUIT BOARD
COMPRESSOR RUNS
install new circuit board, reassemble,
test unit and return to customer
TEST THERMISTOR AND REPLACE
IF NECESSARY
COMPRESSOR RUNS
install new thermistor, reassemble, test
unit and return to customer
COMPRESSOR RUNS
install new main circuit board, reassemble,
test unit and return to customer
TEST WITH NEW MAIN CIRCUIT
BOARD
NO
NO
YES
YES
NO
YES
NO
YES
NO
TEST COMPRESSOR
WINDINGS
COMPRESSOR RUNS
install new compressor control unit,
reassemble, test unit and return to
customer
FRIDGE WILL NOT TURN ON
DOES THE
COMPRESSOR
RUN?
NO
IS THE
COMPRESSOR
FAULTY?
REPLACE COMPRESSOR
Contact a licensed refrigeration mechanic
for assistance
YES
REPLACE CONTROL UNIT
AND REPEAT CONTROL
UNIT TEST
NO
DOES THE
COMPRESSOR
RUN?
IS THE
COMPRESSOR
SEIZED?
REPLACE COMPRESSOR
Contact a licensed refrigeration
mechanic for assistance.
NOTE: THIS IS EXTREMELY UNLIKELY
RECONNECT CONTROL UNIT
YES
YES
NO
YES
COMPRESSOR DOES NOT RUN
Contact ARB for technical advice
YES
CHECK BATTERY
PROTECTION SETTING
CHECK VEHICLE WIRING
TEST WITH NEW CONTROL PANEL
CIRCUIT BOARD
TEST WITH NEW MAIN CIRCUIT
BOARD
CHECK CONNECTION OF DC WIRING TO "+" AND "-"
TERMINALS ON COMPRESSOR CONTROL UNIT
CHECK INTERNAL DC WIRING BETWEEN POWER
SOCKET AND COMPRESSOR CONTROL UNIT
CHECK DC SUPPLY SOCKET FOR
CORRECT VOLTAGE AND POLORITY
IS 12/24V DC
AVAILABLE AT
FRIDGE POWER
SOCKET?
IS 12/24V DC
AVAILABLE AT
TERMINALS "+" AND "-"
ON COMPRESSOR
CONTROL UNIT?
IS 12V DC AVAILABLE AT
TERMINALS "A" AND "C"
ON COMPRESSOR
CONTROL UNIT?
CHECK FRIDGE POWER LEAD AND PLUG FUSE
NO
NO
NO
YES
YES
YES
CHECK ALL PLUG AND SOCKET CONNECTIONS
TEST WITH NEW COMPRESSOR
CONTROL UNIT
COMPRESSOR RUNS
install new compressor control unit,
reassemble, test unit and return to
customer
IS TARGET
TEMPERATURE
REACHED?
TO TEST FOR CORRECT OPERATION,
REDUCE TARGET CABINET
TEMPERATURE
TO TEST FOR CORRECT OPERATION,
CONNECT FRIDGE TO 100-240V AC POWER.
NOTE : Battery protection system is not
active with AC power.
POWER LED WILL CHANGE TO GREEN.
COMPRESSOR WILL START
FRIDGE WILL START COOLING
NO
YES
CHECK POLARITY ("+" & "-"). THE CONTROL UNIT HAS
POLARITY PROTECTION AND WILL NOT FUNCTION IF
POLARITY IS INCORRECT.
NOTE: Digital display will not operate if
supply voltage is below 7V DC
NOTE: A poor connection (particularly at the
socket at the back of the fridge) can cause a
large voltage drop between the power source
and the fridge.
TEST WITH NEW CONTROL PANEL
CIRCUIT BOARD
