Identify and eliminate faults
A190-930TX_EN_03_ 2009-02-06 55
Table of possible faults
Fault Possible cause Remedy
Spec. personnel
Service engineer
Muffler or filter element of the muffler
is contaminated.
Check mufflers or filter elements for
contamination, clean if nec., and poss.
renew.
Expansion valve V4/V5 does not open
correctly.
Check expansion valve for
contamination, if nec. renew gaskets.
Excessive dam pressure
during regeneration
Dust sieves are contaminated. Clean or renew dust sieves.
Vessel pressure is too
low
Excessive differential pressure on the
upstream filter (option).
Check differential pressure on the
upstream filter, if. nec. renew filter
element.
The compressed air system upstream
of the dryer is not pressurised.
Check whether the compressed air
system upstream of the dryer is
pressurised. Remove any faults.
Check valve V2/V3 is leaky. Check check valve, if nec. renew
gasket.
Solenoid valve Y3/Y4 does not close. Check supply voltage, cable, contacts
and solenoid; replace, if necessary.
No pressure build up
Expansion valve V4/V5 does not
close.
Check gaskets for contamination, if nec.
clean/renew.
Excessive compressed
air consumption
Leakage. Check condensate trap at the upstream
filter (option); clean, if necessary.
Solenoid valve Y1/Y2 does not open. Check supply voltage, cable, contacts
and solenoid; replace, if necessary.
Main inlet valve V1 does not switch
correctly.
Check operating pressure of control air;
if nec. restore. Otherwise check
function/easy switching of main inlet
valve, if nec. renew.
Solenoid valve Y1/Y2 cannot be
opened properly
(audible humming sound or valve
flapping).
Check supply voltage.
Check solenoid valves; replace, if
necessary.
Control board defective. Check fuse in supply line and in the
switchbox; replace, if necessary.
Power supply interrupted, cable
broken.
Reconnect the unit to the power supply.
Compressor might be off. Check compressor synchronisation
circuit.
Dryer does not switch
over
Error in control programme. Restart programme.
Solenoid valve Y3/Y4 cannot be
opened.
Check supply voltage, cable, contacts
and solenoid; replace, if necessary.
Solenoid valve Y3/Y4 cannot be
opened properly (audible humming
sound or valve flapping).
Check supply voltage.
Check solenoid valves; replace, if
necessary.
Expansion valve V4/V5 does not open
correctly.
Check gaskets for contamination, if nec.
clean/renew.
No expansion
Muffler blocked. Check muffler for contamination, if nec.
clean/renew.
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