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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
Action
Machine does not start.
Fuse blown or circuit breaker
tripped.
Check motor connections and
fuses (circuit breakers).
Defective contact in the user's
pressure switch.
Replace pressure switch.
Motor overload protection has
tripped.
Allow the motor to cool down.
Drive motor defective: bearing
damage or windings shorted.
Contact KAESERservice.
Compressor block defective.
Contact KAESERservice.
The oil level monitor (option C5)
has triggered.
Check undervoltage trip in the
user's pressure switch or 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 KAESERservice.
Piston seized due to insufficient
or incorrect oil.
Contact KAESERservice.
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.
Swap the L1 and L2 connections
to the drive motor.
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 KAESERservice.
9
Fault Recognition and Rectification
9.1
Basic Information
48
Assembly and operating manual 2-stage piston compressor
EPC-2-G
No.: 9_5753_04 E