Message Possible cause Remedy
DO1.6/DO1.7 I⇞ Short circuit in the line between the dig‐
ital output and the consumer.
Check line and connections.
airend rotation The drive motor is turning in the wrong
direction.
Changeover phase lines L1 and L2.
error: RS485-USS Fault in the data transfer with USS pro‐
tocol (RS485) between the
SIGMA CONTROL and the frequency
converter.
Cable between the SIGMA CONTROL
and the frequency converter.
Check the cable shielding.
ext. message 0
ext. message 1
ext. message 2
ext. message 3
ext. message 4
ext. message 5
Customer specific:
component connected reports a fault
Remove the fault in the connected com‐
ponent.
FC Frequency converter faulty. Call KAESER Service.
back press. run Drive belts or coupling broken. Drive belts:
Replace drive belts.
Coupling:
Call KAESER Service.
back press. stop Back pressure in the oil separator tank
caused by defective venting.
Check venting line.
HT cell Fault in the high tension cell. Call KAESER Service.
no press.buildup The machine produces no compressed
air.
The working pressure does not rise
above 3.5 bar within the preset period.
Check the machine for leaks.
Check coupling / V-belts
Call KAESER Service.
comp. T ⇟ Thermostatic valve defective Call KAESER Service.
condensatedrain The condensate drain is defective. Refrigeration dryer: check condensate
drainage.
RD condens.drain Refrigeration dryer:
The condensate drain is defective.
Refrigeration dryer
Check the condensate drain.
RD p⇞ Refrigeration dryer:
pressure too high in the refrigerant cir‐
cuit.
Safety pressure switch tripped.
Clean the refrigerant condenser.
Check the fan motor.
Maintain operating conditions.
RD p⇟ Refrigeration dryer:
refrigerant lost; pressure in the refriger‐
ant circuit too low. Inlet pressure switch‐
ed tripped.
Call KAESER Service.
RD T⇟ Refrigeration dryer:
Compressed air temperature too low.
Call KAESER Service.
WC water volume Cooling water pressure is too low. Check cooling water supply.
Cooling water stop valve:
Check open/closed.
WC – –
9 Fault Recognition and Rectification
9.2 Alarm messages (machine stop)
54
Service Manual Screw Compressor
BSD 9_5708 08 USE
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