Unit is shut down
The alarm LED will flash indicating either that the outlet temperature is too high or that the motor overload
relay has tripped. Remedy the problem. It may be necessary to reset the display after remedying the fault:
press the “Reset” key (2), the message “All protection functions are OK” will appear, after which the
compressor can be restarted.
Excessive oil consumption
Have the compressor inspected by the Atlas Copco Customer Centre.
Condition Fault Remedy
Condensate is not discharged from
condensate traps during loading.
Discharge pipe of condensate trap
clogged.
Check and correct as necessary.
Float valve of condensate traps
malfunctioning.
Remove float valve assembly,
clean and check.
EWD (electronic water drain)
malfunctioning.
Consult Atlas Copco.
Condition Fault Remedy
Compressor air delivery or pressure
below normal.
Air consumption exceeds air
delivery of compressor.
Check equipment connected.
Choked air filters. Replace filters.
Air leakage. Check and correct.
Condition Fault Remedy
Compressor element outlet
temperature or delivery air
temperature above normal.
Oil level too low. Check and correct.
Oil coolers clogged. Consult the section Coolers.
Air cooler clogged. Consult the section Coolers.
On air-cooled compressors,
insufficient cooling air or cooling
air temperature too high.
Check and correct as necessary.
On water-cooled compressors,
cooling water flow too low.
Increase flow.
On water-cooled compressors,
restriction in cooling water system.
Consult Atlas Copco Customer
Centre.
Instruction book
146 2920 1728 05
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