9 Fault Recognition and Rectification
9.1 Basic Information
The alarm indications valid for your machine are dependent on the individual equipment.
1. Do not attempt fault rectification measures other than those given in this manual.
2. Inform KAESER Service if the fault cannot be rectified by the measures suggested.
9.2 Alarms
Fault Possible cause Remedy
Machine does not start. Fuse blown or circuit breaker
tripped.
Check motor connections and
fuses (circuit breakers).
Defective pressure switch con‐
tact.
Replace pressure switch.
Motor overload protection has
tripped.
Allow the motor to cool down.
Compressor motor defective:
bearing damage or winding
short-circuit.
Contact KAESER service.
Compressor block defective. Contact KAESER service.
The oil level monitor (option C5)
has triggered.
Check the undervoltage trip of
the controller.
Machine starts with difficulty. The solenoid valve is not open‐
ing.
Check the connection to the sol‐
enoid valve.
Change the solenoid valve.
Bearing damage. Contact KAESER service.
Piston seized due to insufficient
or incorrect oil.
Contact KAESER service.
Fault in the power supply. Check power supply.
Oil level too high. Drain out some oil.
Machine runs hot. Ambient temperature too high. Reduce the ambient tempera‐
ture.
Wrong direction of rotation. Changeover phase lines L1 and
L2.
Fan cannot draw air freely. Ensure unrestricted flow of air to
the fan.
Valve plate leaking air or coked. Check or clean the valve plate.
Outlet valve reed broken. Replace valve plate.
Motor overload protection trips
out after a short time.
Fault in the power supply. Check power supply.
Motor fault. Contact KAESER service.
9 Fault Recognition and Rectification
9.1 Basic Information
No.: 9_9431_02 E
Service Manual 2-stage piston compressor
EPC
43
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