18
FAULT DIAGNOSIS FLOW CHART
REFRIGERATION SYSTEM
IS
COMPRESSOR
RUNNING
Change
capacitor and
start relay
End
Faulty
compressor
No
Resite unit
Leave unit to
recover
Is the python length
excessive or exposed
to high temperatures
Check for
refrigerant
leaks
Re route
python and
resite unit
closer to
dispense point
Is there 240
volts at the
compressor
Follow
thermostat
fault guide
No
Yes
Has the unit
got an ice
bank
Is the Condense r
blocked or airflow
restricted
Is the
condenser fan
running
Faulty fan
motor or
wiring
connection
No
Yes
Is the unit sited in
an excessive
ambient
temperature
(40°C+)
Clean
condenser ,
ensure good
airflow
Yes
No
Yes
Has the unit been
subjected to heavy
product draw.
Is the
compressor
running
No
Yes
Yes
Repair
refrigerant
leak
Yes
Yes
Change
Compressor
Has the unit
got a full ice
bank
No
Unit cut out on
thermostat
Yes
AIR COOLED
UNITS
WATER
COOLED
UNITS
Has the unit
got an ice
bank
Yes
Are the coils frozen in
and\or the compressor
will not switch off
Yes
Faulty
thermostat
Yes
Are the coils frozen in
and\or the compressor
will not switch off
Yes
Faulty
thermostat
No
Yes
Is the Heat
Dump fan
running
Follow heat dump
fault guide
No
Is the glycol coolant
level correct and
is it recirculating
adequately
Yes
Follow Glycol
Module fault guide
No
Yes
No
No
No
Yes
No
Is the system fault
light on.
(WATER COOLED
ONLY)
No
No
Yes
