SEM
II/13
GB
B Pressure relief does
not function
The pressure relief is shut
down by an interruption of the
power supply or voltage drop in
the mains when the compres-
sor is switched on.
X
Switch off the compressor. It de-
pressurises. Switch on the com-
pressor.
C Compressor does
not start when
switched on.
Vessel pressure is higher than
switch-on pressure.
X
Relieve pressure in the vessel
until the pressure switch is acti-
vated automatically.
Power supply faulty.
X
Have the power supply checked
by a qualified person (service
partner).
Protective motor switch inter-
rupts power supply.
X
See item A.
Pressure switch defective
X
Have the pressure switch
changed by a qualified person.
D The compressor
starts up briefly
when the switch-on
pressure is reached
or hums, then
switches off auto-
matically.
Mains connection cable longer
than permitted or the cross
section is too small.
X
Check connection cable length
and cable cross-section (see
Chap. 2.4.4)
E
Compressor runs
continuously.
Intake filter badly contami-
nated.
X
Clean or replace intake filter.
Air consumption of compressed
air tools is too high.
X
Check the air consumption of the
tools. Contact the service partner
Leakage at compressor.
X
Locate leak, contact service part-
ner.
Excessive condensate in the
vessel.
X
Drain the condensate (see
Chap. 2.6.5).
Compressed air line leaky:
X
Check compressed air line, plug
leak.
Condensate drain valve is open
or missing.
X
Close or replace.
F
During operation,
compressed air
escapes via the
load-relieving valve.
Load-relieving valve leaky.
X
Clean or replace load-relieving
valve.
G After the switch-off
pressure is reached,
compressed air
escapes via the
load-relieving valve
until switch-on
pressure is reached
Check valve insert leaky or
defective.
X
Clean or replace the check valve
insert (see Chap. 2.6.10).
Check valve is damaged.
X
Replace check valve.
H Compressor
switches on fre-
quently.
Excessive condensate in the
pressure vessel.
X
Drain the condensate (see
Chap. 2.6.5).
Compressor overloaded.
X
See item E
Problem
Cause
Remedy
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