Operating and Maintenance Manual 09/2019 – part I
Screw compressors
41
9. Troubleshooting
Symptom Cause Remedy
The compressor
cannot start
Power supply failure
Check for the presence of voltage at
the power cable terminals.
Activation of the main protection Check the protection, replace it with
the new one when it is faulty. In other
case, contact the BERG service or
authorised service centre listed in the
Warranty Book.
Incorrect phase sequence
(compressors with microprocessor
control)
Change connection of two phase
conductors on the compressor
terminal block or in the distribution
board.
Faulty temperature sensor In case of any malfunctions, contact
the BERG service or authorised
service centre listed in the Warranty
Book.
The temperature sensor
(microprocessor controller)
activated because of too high
temperature
Check:
- the oil level and top it up if
necessary,
- cooling: remove causes of
insufficient cooling,
- thermostat: contact the BERG
service or authorised service
centre listed in the Warranty
Book.
The compressor
is running, but it
does not
generate
compressed air
The compressor is not connected
to the compressed air system.
Connect the compressor to the
compressed air system.
The suction valve does not open or
opens partially.
Check operation of the solenoid valve.
Some leaks in the compressor
pneumatic system or in the
compressed air system.
Repair any leaks.
Too high installation demand for
compressed air.
Reduce the number of compressed air
receivers, check the compressed air
system for leaks and repair leaks if
any.
Difficult start of
the compressor
Too low supply voltage Check the supply voltage and provide
the correct, if necessary.
Too low ambient temperature Heat the room to temperature of at
least +5°C.
Oil is too thick Oil is incorrect. Change the oil to the
one recommended by the
manufacturer.
Incorrect rotation
direction
Incorrect phase sequence Change connection of two phase
conductors on the compressor
terminal block or in the distribution
board.
Too high oil
temperature and
the compressor
is shut down
Ambient temperature >40°C
Provide sufficient ventilation of the
room.
Dirty cooler Clean the cooler.
Delivery pressure is higher than
the set one.
Adjust the pressure switch or enter
the correct settings into the controller.
Too low oil level Replenish the oil to the required level.
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