Message Possible cause Remedy
error: RS 485–PP Wrong configuration or transmis‐
sion error.
Check the link/interface connections be‐
tween the two controllers.
Check maximum cable length and screen‐
ing.
1 master and 1 slave configured.
error SMS SMS can not be sent. Call authorized KAESER Service represen‐
tative.
ext. message 0
ext. message 1
ext. message 2
ext. message 3
ext. message 4
ext. message 5
Customer specific:
no details possible.
–
FC AI1 fault SFC machine:
Network pressure sensor on AI1
defective.
Call authorized KAESER Service represen‐
tative.
FC MM service SFC machine:
Frequency converter service
mode.
Deactivate the service mode as soon as the
frequency converter settings are completed.
FC mains SFC machine:
Frequency converter power supply
failed.
Check power supply.
annual maint Last maintenance was 1 year ago. Carry out the necessary maintenance and
reset the corresponding maintenance inter‐
val counter.
no press.buildup The compressor cannot build-up
to working pressure.
Check for air leaks.
Check the value for internal pressure given
in the
<analog data>
menu against the read‐
ing on the oil separator tank pressure
gauge.
condensatedrain The condensate drain is defective. Check the condensate drain and drain line.
RD condens.drain Refrigeration dryer:
The condensate drain is defective.
Check the condensate drain.
RD p ↓ Refrigeration dryer:
Pressure in refrigerant circuit too
low
Pressure switch activated.
Call authorized KAESER Service represen‐
tative.
RD p ↥ Refrigeration dryer:
Pressure in refrigerant circuit too
high
Pressure switch activated.
Keep ambient conditions within specified
limits.
Clean the refrigerant condenser.
Check the fan motor.
Call authorized KAESER Service represen‐
tative.
RD T ↓ Refrigeration dryer:
Compressed air temperature too
low.
Call authorized KAESER Service represen‐
tative.
9 Fault Recognition and Rectification
9.3 Warning messages (yellow LED lights)
9_5721 06 USE
Service Manual Screw Compressor
ASD T Tri-Voltage
55
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