Condition Fault Remedy
Unit does not start Electrical failure Have electrical system
checked. Check fuses and line
terminals for tightness
Overload relay cut out Reset overload relay. If the
relay cuts out again after
starting, see "Overload relay
cuts out"
Air pressure above pre-set
starting pressure
Compressor will start when air
pressure is lower than pre-set
starting pressure of air pressure
switch
Overload relay cuts out Overload relay incorrectly set Check and adjust. Reset relay
Solenoid valve out of order Remove and check. Replace if
necessary
Unloader plunger jammed Inspect and replace parts
where necessary
Blow-off silencer choked Replace
Ambient temperature too high Improve ventilation of room
Motor stops and starts too
frequently
See "Too frequent starting/too
short operating periods"
Overcurrent due to motor or
compressor failure
Consult Atlas Copco
Instruction book
66 2920 7089 90
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