SYMPTOM
PROBABLE CAUSES
REMEDY
Compressor unit will not
Pressure switch defective.
Have pressure switch
stop automatically.
changed by an electrician
Pressure switch set at a
Adjust pressure switch
pressure higher than the
or safety valve
safety valve’s opening
WARNING:DO NOT
pressure.
ADJUST SAFETY VALVE
ABOVE MAXIMUM
WORKING PRESSURE
DETAILED.
Bleed valve under
Non-return valve leaking.
Clean non-return valve
pressure switch blows
or replace.
whilst compressor is
not running.
Bleed valve under
Relief valve leaking.
Clean relief valve or
pressure switch
change pressure switch.
blows whilst machine
is running.
Compressor runs
Suction filter blocked.
Change filter.
continuously and can’t
V-belt too slack (not
Tighten V-Belt.
attain the working
applicable to direct
pressure required.
drive machines).
Leak between compressor
Tighten connection and
block and air receiver/
repair leak.
leaks in or near air receiver.
RPM too low because of
Call an electrician.
incorrectly connected
electric motor.
Valves blocked by dirt,
Clean or change valves.
paint, dust or coked up.
Inspection cover or plug
Empty air receiver and
leaking.
change seal.
Suction rendered difficult or
Larger fresh-air inlet.
impossible at suction intake
or the air being taken in is
too warm.
Pressure gauge defective.
Change pressure gauge.
Unit too small in relation to
Connect a supplementary
air consumption.
compressor or install a
larger model.
Compressor worn.
Have compressor over-
hauled or replace it.
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