Message Possible cause Remedy
0091 A
0092 A
0093 A
p-Switch pi
0094 A
T-Switch ADT
0095 A
p-Switch pN
0097 A
High-voltage cell on?
High-voltage cell does not ac‐
tivate.
Check high-voltage
cell and wiring.
0098 A
High-voltage cell off?
High-voltage cell does not de‐
activate.
Check high-voltage
cell and wiring.
0099 A
Mains contactor on?
Main contactor does not
close.
Check main con‐
tactor and wiring.
0100 A
Mains contactor off?
Main contactor does not
open.
Check main con‐
tactor and wiring.
0101 A
Compressor motor overcurrent
Overload shut-down of the
compressor drive motor.
Investigate cause
of shut-down.
Change the oil
separator car‐
tridge.
0102 A
Oil-/air cooler fan Overcurrent
Overload shut-down of the
first fan motor.
Investigate cause
of shut-down.
Reset the overload
relay.
0200 A
Compressor motor USS alarm
Frequency converter fault Contact an author‐
ized KAESER
service representa‐
tive.
0201 A
Compressor motor USS alarm
Frequency converter fault Contact an author‐
ized KAESER
service representa‐
tive.
0202 A
Compressor motor USS alarm
Frequency converter fault Contact an author‐
ized KAESER
service representa‐
tive.
0205 A
Compressor motor USS alarm
Communications error Check connection
and line path.
0210 A
Compressor motor FC Motor overload alarm
Frequency converter fault Contact an author‐
ized KAESER
service representa‐
tive.
15 Interpreting fault messages
30
Quick user guide Controller
SIGMA CONTROL 2 SCREW FLUID 1.1.3 9_9450 03 USE
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