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9.4
Tab. 34
52
9
Fault Recognition and Rectification
9.4
Other Faults
Other Faults
Fault
Machine runs but produces no
compressed air.
Cooling oil runs out of the air fil‐
ter.
Compressor switches between
LOAD and IDLE more than twice
per minute.
Cooling oil leaking into the floor
pan.
Cooling oil consumption too
high.
Other faults and actions
Service manual
Screw compressor
Aircenter SX 3/7.5 SIGMA CONTROL BASIC
Possible cause
Inlet valve not opening or only
opening partially.
Venting valve not closing.
Leaks in the pressure system.
Air consumption is greater than
the capacity of the compressor.
Hose coupling or maintenance
hose still plugged into the quick-
release coupling on the oil sep‐
arator tank.
Oil level in the oil separator tank
too high.
Inlet valve defective.
Air receiver too small.
Airflow into the compressed air
network restricted.
The differential between cut-in
and cut-out pressure too is
small.
Hose coupling or maintenance
hose still plugged into the quick-
release coupling on the oil sep‐
arator tank.
Oil cooler leaking.
Leaking joints.
Unsuitable oil is being used.
Oil separator cartridge split.
Oil level in the oil separator tank
too high.
Oil return line clogged.
Remedy
Call authorized KAESER Ser‐
vice representative.
Call authorized KAESER Ser‐
vice representative.
Check pipework and connec‐
tions for leaks and tighten any
loose fittings.
Check the air system for leaks.
Shut down the consumer(s).
Remove coupling or mainte‐
nance hose.
Drain off oil until the correct level
is reached.
Call authorized KAESER Ser‐
vice representative.
Increase size of air receiver.
Increase air pipe diameters.
Check filter elements.
Check switching differential.
Remove coupling or mainte‐
nance hose.
Call authorized KAESER Ser‐
vice representative.
Tighten joints.
Replace seals.
Use SIGMA FLUID cooling oil.
Change the oil separator car‐
tridge.
Drain off oil until the correct level
is reached.
Check dirt trap in the return line.
Number: 9_6945 01USE
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