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Diagnosis
(cont.)
Fault
Possible cause
Compressor can-
Power supply line break
not function
High pressure switch has
tripped
Control fuse blown
Core(s) of the supply cable
loose
Wiring incorrect
Supply voltage too low
Compressor motor short
circuit
Compressor seized
Low pressure
Refrigerant leak
switch is tripped
Inadequate refrigerant fill-
and switches the
ing
unit off
Low pressure switch faulty
High pressure
High pressure switch
switch is tripped
and switches the
Gases in the refrigerant cir-
unit off
cuit that cannot be com-
pressed
Fan failed
Liquid line too hot
Inadequate refrigerant fill-
ing
Liquid line frosted
The shut-off valve in the li-
over
quid line is partially closed
Filter dryer blocked
Troubleshooting
Measures
Check power supply for short
circuit or earth fault. Check
fuses
Locate and remove the rea-
son for the tripping. Reset
the high pressure switch and
restart the unit
Check control circuit for
short circuit or earth fault.
Check the fuse
Secure cores at the term-
inals
Check the wiring of the con-
trol and safety equipment
Check the on-site installation
(e.g. cable cross-sections). If
no on-site causes can be es-
tablished, inform the relevant
power supply utility
Check the motor winding for
continuity
Replace compressor
Identify and repair leak
Top up refrigerant
Replace low pressure switch
Replace high pressure
switch
Vent the refrigerant circuit
Check supply cable and fan
motor and replace, if re-
quired
Determine and remedy the
cause for the refrigerant loss;
top up with refrigerant
Check whether all valves in
the refrigerant circuit are
open
Replace the filter dryer
27
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