Message Possible cause Remedy
0017 A
dT ⇞
T2/T1 temperature differ‐
ence too high.
Check operating conditions.
Check all feed lines, discharge lines, the in‐
let and the discharge silencers and the
blower block.
0018 A
Filter blocked
Inlet filter clogged. Replace the inlet filter.
0019 A
FC error %d
Internal fault, frequency
converter.
Call KAESER SERVICE.
0020 A
Oil level side B
Lubricant level at the blow‐
er block control side too
low.
Replenish with lubricating oil.
0021 A
External message 1
1)
0022 A
Aftercooler
Current draw of the fan
motor too high.
Temperature too high.
Aftercooler clogged.
Check fan
Check operating conditions.
Clean the aftercooler.
0023 A
USS bus
communication error
A fault occurred in the data
transmission between con‐
troller and the FC of the
compressor drive.
Call KAESER SERVICE.
0024 A
Diagnostics group alarm
A diagnostic message has
occurred.
For more details, see the text of the diag‐
nostic message.
Call KAESER SERVICE.
0025 A
T3 ⇞
Oil temperature is very
high.
Check the ambient and operating condi‐
tions.
0026 A
π=p2_a/p1_a ⇞
Pressure ratio across the
block is too high - fault.
Inlet conditions (pressure) or back pressure
is too high.
Check filter.
Check the position of the process valves.
0027 A
T1 ⇟
Inlet temperature is too
low – Fault T1 very low.
Check the inlet conditions (pipe, space) -
Check the ambient and operating condi‐
tions.
0028 A
Error USS handler %d
Blower USS bus fault Check connection and line path.
0029 A
PKW requests
failed %d %d
USS Communication fault Check connection and line path.
0030 A
Error FC ramp up
Error while activating the
FC.
Call KAESER SERVICE.
0031 A
Motor: n min not
reached
Frequency converter fault Call KAESER SERVICE.
0032 A
Heavy load monitoring
triggered
Frequency converter fault Call KAESER SERVICE.
10 Fault Recognition and Rectification
10.2 Interpreting fault messages
No.: 901700 10 E
Service Manual Controller
SIGMA CONTROL 2 BLOWER ≥ 2.5.3
153
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