Message Possible cause Remedy
0021 A
Refrigeration dryer T ⇟
Refrigerated dryer:
Compressed air tempera‐
ture too low.
Contact
KAESER Service.
0022 A
Oil separator Δp ⇞
Oil separator cartridge clog‐
ged.
Change the oil sepa‐
rator cartridge.
0023 A
Motor bearings
Drive motor bearings over‐
heated.
Re-grease the motor
bearings.
0024 A
Water-cooling water shortage
Cooling water pressure is
too low.
Check cooling water
supply.
0034 A
Mains contactor on?
Main contactor does not
close.
Check main contac‐
tor and wiring.
0035 A
Cabinet fan I ⇞
Overload shut-down of the
control cabinet fan motor.
Contact
KAESER Service.
0038 A
PD temperature ⇟
Package discharge (PD)
temperature too low.
Contact
KAESER Service.
0039 A
PD temperature ⇞
Package discharge (PD)
temperature too high.
Check the cooling oil
level.
Clean the cooler.
Check the fan motor.
0040 A
Mains contactor off?
Main contactor does not
open.
Check main contac‐
tor and wiring.
0041 A
Mains voltage ⇟
Second power failure. Check power supply
voltage.
Check the door inter‐
lock switch.
0042 A
Back pressure stop
Back pressure in the oil
separator tank caused by
defective venting.
Check venting line.
0043 A
Airend discharge temperature ADT rise dT/dt⇞
The rate of rise of the air‐
end discharge temperature
(ADT) is too fast.
Check the cooling oil
level.
0044 A
No pressure buildup
The machine does not pro‐
duce compressed air.
The working pressure does
not rise above 50 psi within
the preset period.
Check the machine
for leaks.
Check coupling and
V-belt.
0045 A
Compressor T ↓↓
Thermostatic valve defec‐
tive
Contact
KAESER Service.
0048 A
High-voltage cell
Fault in the high voltage
cell.
Contact
KAESER Service.
0051 A
Aggregate A
Aggregate A failed. Contact
KAESER Service.
0052 A
Aggregate B
Aggregate B failed. Contact
KAESER Service.
9 Fault Recognition and Rectification
9.2 Interpreting alarm messages
9_9450 03USE
Service manual Controller
SIGMA CONTROL 2 SCREW FLUID 1.1.3
159
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