Revision Date
– 22/12/2014
page 15
TROUBLESHOOTING
DC Power Supply (continued)
Symptom
Possible Cause(s)
Suggested Action(s)
Fridge runs but digital
display is not visible.
Faulty control panel circuit
board.
Test with new control panel circuit board
(refer to section
). If symptom resolved,
replace circuit board.
Fridge runs but cannot
change target temperature.
Faulty control panel circuit
board.
Test with new control panel circuit board
(refer to section
). If symptom resolved,
replace circuit board.
Fridge does not run, error
light flashes twice every 5
seconds
The fan is not connected to
the compressor control unit.
Check the fan wiring to ensure the “+ve”
and “–ve” fan wires are correctly
connected to the compressor control unit
(refer section
Faulty fan.
Test with new cooling fan (refer to section
). If symptom resolved, replace fan.
NOTE: The fan must be running whenever
the compressor is running.
Faulty compressor control
unit.
Test compressor control unit (refer to
section
). If symptom resolved, replace
control unit (refer to section
Interior cabinet light does
not work.
Interior light globe has blown.
Replace light globe (refer to section
No power to fridge.
Check that either 12/24V DC or 100-240V
AC power is being supplied to the fridge.
Faulty main circuit board
Test operation of light with new main
circuit board (refer section
). If symptom
resolved, replace circuit board.
Faulty light switch
Replace cabinet assembly.
Digital display shows
“Err1”
The thermistor is not correctly
connected to the control
panel circuit board.
Check connection of thermistor to control
panel circuit board.
Thermistor circuit is ‘open
circuit’.
Test thermistor (refer to section
) and
replace if necessary.
Digital display shows
“Err2”
Thermistor circuit is ‘short
circuit”
Test thermistor (refer to section
) and
replace if necessary.
Digital display shows
“Err3”
Faulty control panel circuit
board.
Replace control panel circuit board (refer
to section