Summary of faults
56 A190-930TX_EN_03_ 2009-02-06
Fault Possible cause Remedy
Spec. personnel
Service engineer
Solenoid valve Y3/Y4 cannot be
closed properly (audible humming
sound or valve flapping).
Check supply voltage.
Check solenoid valve; replace, if
necessary.
Dryer is continuously
bled
Expansion valve V4/V5 does not close
correctly.
Check gaskets for contamination, if nec.
clean/renew.
Dryer is excessively bled Solenoid valve Y1/Y2 cannot be
closed.
Check solenoid valves; replace, if
necessary.
Operating pressure is too low. Increase operating pressure.
Compressed air volume flow is too
high.
Reduce compressed air volume flow
Compressed air inlet temperature is
too high.
Reduce compressed air inlet
temperature or pre-connect a
compressed air cooler.
Control board is defective. Check control board, if nec. renew.
Differential pressure on the upstream
filter (option) is too high.
Check differential pressure on the
upstream filter, if nec. renew filter
element.
Condensate trap on the upstream
filter (option) does not work.
Check function of the condensate trap,
if nec. clean or renew.
Check upstream filter for contamination,
if nec. renew element.
Drying agent is contaminated or too
old.
Check drying agent for contamination, if
nec. renew drying agent.
Pressure dew point is not
reached
Regeneration gas too low. Check function of expansion valve
V3/V4 and muffler, if nec. renew muffler
or filter element.
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