Possible Cause
Remedy
Suction regulator does not close completely
Provide access to the suction regulator, replace if
necessary.
Check solenoid valves (Y1) and pressure reducing
valve (12).
Chart 7-2: Troubleshooting upon: The system remains stationary during the start-up phase
Fault: System does not reach the set line pressure
Possible Cause
Remedy
Line pressure sensor defective
Check line pressure sensor, replace if necessary.
Too large air bleed
Throttle the air bleed valve or switch on/use further
compressors.
Oil fine separator soiled
Replace oil fine separator cartridge
Air filter contaminated
Replace air filter cartridge.
Heavy leaks
Check compressor. For example:
Check for leaks.
Safety valve defective or open after checking.
Condensate drain set to test function.
Suction regulator does not open completely
Provide access to the suction regulator, replace if
necessary.
Check solenoid valves (Y1) and pressure reducing
valve (12) and replace if necessary.
Chart 7-3: Troubleshooting upon: System does not reach the set line pressure
Fault: System switches off
Possible Cause
Remedy
Water inlet temperature too high
(only water-cooled compressors)
Check the cooling water supply.
Ambient temperature too high
Ventilate the compressor room.
Electric motor defective
Check electric motor and posistor.
Fan defective
Check fan, replace if necessary.
Sensors, connections or leads defective
Check sensors, connections and leads.
Wire cross section of the electrical leads too small Measure current consumption, if necessary replace
leads.
Oil level too low
Top up oil in the pressure vessel
Oil injection pressure too low
Replace oil filter cartridge. Clean oil system
Oil temperature too high
Check oil cooler and fan
Check Oil temperature regulator
Check cooling water circuit (only for Lxxx W –
water-cooled systems)
Compressor defective
Replace compressor
Chart 7-4: Troubleshooting upon: System switches off
