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TROUBLESHOOTING
16
Symptom
Cooling
A The unit does
not start
B The compressor
does not start
C The
compressor starts
up and stops
repeatedly
D The compressor
does not start
because the
maximum
pressure switch
has tripped
Who can take
corrective action U
Heating
= User
S = specialised
personnel
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
Probable cause
s
Probe faulty service
Lack of consent of the high or low
s
pressure
s
Defective compressor
s
Compressor burnt or seized
Compressor contactor de-
s
energized
s
Power circuit open
s
Motor thermal protection open
s
Intervention of the minimum
s
Compressor contactor defective
Calibration values of the set- point
u
or differential
s
Lack of coolant
s
Pressure switch out of order
s
Overcharge of refrigerant
Finned coil clogged, air flow rate is
u
too low
s
Fan not working
s
Water pump circulation blocked
Water circulation pump and
x
defective
Presence of non condensable
s
gases in the refrigerant circuit
s
Refrigerant filter clogged
Page 33
Possible remedy
Check and replace if necessary.
See points D-E
See point B.
Replace the compressor.
Check the voltage across the coil of the
compressor contactor and the continuity of
the coil.
Investigate the cause of the protection, and
check if there are any short circuits in the
wiring
or in the windings of the motors of pump,
fan, compressor and transformer
The compressor has operated in critical
condition or there is a lack of charge in the
circuit: Make sure that working conditions
are within the limits of operation. Loss of
coolant: see section G.
See point E.
Check and replace if necessary.
Modify them as reported in the in the tables.
See point G
Check and replace.
Download the excess refrigerant
Remove dirt from the coil and obstructions
to the air flow
See point F.
Unblock the pump.
Check and replace if necessary.
Prime the circuit after it has been
downloaded and put under vacuum.
Check and replace.
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