UNM Clean - OF
II/11
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.
Only devices with membrane
dryer: off-time too short.
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
B Pressure relief does
not function
(only devices with-
out membrane
dryer)
Solenoid valve faulty
Replace or contact service part-
ner
C Compressor does
not start when
switched on.
Vessel pressure is higher than
switch-on pressure.
Relieve pressure in the vessel
until the pressure switch is acti-
vated automatically.
Power supply faulty.
Have the power supply checked
by a qualified person (service
partner).
Protective motor switch inter-
rupts power supply.
See item A.
Pressure switch defective
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
Check connection cable length
and cable cross-section (see
Chap. 2.4.4)
E Compressor runs
continuously
Intake filter badly contami-
nated
Clean or replace
Air consumption of compressed
air tools is too high
Check air consumption. Contact
the service partner
Leakage at compressor
Locate leak, contact service part-
ner
Excessive condensate in the
vessel (only devices without a
membrane dryer)
Drain (see Chap. 2.6.6)
Compressed air line leaky
Check the compressed air net-
work, seal leak
Condensate drainage ball valve
open
Close
Filter elements upstream of
membrane dryer heavily
clogged (only devices with
membrane dryer)
Replace filter elements (see
Chap. 2.6.10 and 2.6.11)
