UNM STS/STL
II/5
GB
2.8 Troubleshooting
Problem
Cause
Remedy
A Protective motor
switch interrupts
power supply
In case of malfunctions (e.g.
overheating; low voltage;
extension cable too long or
with incorrect cross-section),
the protective motor switch is
tripped.
X
Switch off the compressor. Wait a
short while. Actuate the protec-
tive motor switch is available.
Switch on the compressor.
Protective motor switch trips
again: switch off compressor.
Disconnect the power supply.
Contact the service partner
W Pressure relief does
not function
Power failure / undervoltage in
mains with compressor
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 (e.g. ser-
vice 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 Compressor starts
up briefly / buzzes
and then switches
off automatically
Mains connection cable longer
than permitted or the cross
section is too small
X
Check connection cable length
and cable cross-section (see
Chap. 2.4.3)
E
Compressor runs
continuously
Intake filter badly contami-
nated
X
Clean or replace
Air consumption of compressed
air tools is too high
X
Check air consumption. Contact
the service partner
Leakage at compressor
X
Locate leak, contact service part-
ner
Excessive condensate in the
tank
X
Drain the condensate (see
Chap. 2.6.3)
Compressed air line leaky
X
Check the compressed air net-
work, seal leak
Condensate drain valve is open
or missing
X
Close or replace
F
Load-relieving valve
is blowing off
Load-relieving valve leaky
X
Clean or replace
G Switch-off pressure
reached: load-
relieving valve
blows off until
switch-on pressure
is reached
Check valve insert leaky or
defective
X
Clean or replace (see
Chap. 2.6.10)
Check valve is damaged
X
Replace
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