Message
Possible cause
Remedy
0017W
T3 ↑
Oil temperature T3 too high (only when
used with rotary screw blowers) → oil
temperature
Check operating conditions
(max. speed/pressure)
Ambient temperature too high
Cooling air supply clogged
Check direction of rotation for
sound enclosure fan.
Contact an authorised service
partner.
0018W
π=p2_a/p1_a ↑
Pressure ratio across airend too high -
warning
Inlet conditions (pressure) or
back pressure too high
Check filter.
Check position of process
valves.
0019W
T1 ↓
Inlet temperature too low – warning.
Check inlet conditions (piping,
room)
Check climatic conditions
around machine
0020W
T_M ↑
Compressor motor too hot.
Keep ambient conditions within
specified limits.
Check cooling air supply.
Clean motor.
0021W
p1 ↓
Inlet pressure too low – warning.
Check inlet conditions (piping,
room)
Check position of process
valves.
Severe clogging of inlet louvre
0022W
Motor starts ↑
Max. switching frequency / h exceeded Check operating conditions
and/or operating mode
0023W
FC error %d
Numerical value is the fault code for
the frequency converter
Contact an authorised service
partner.
0024W
FC service mode
activated
FC in service mode
Deactivate service mode in
10.1.1.2 menu
0025W
Test of cut-of paths
required
STO channels must be tested
Switch off FC
0026W
Machine test
measurement of block
speed active
Test mode active
Switch off test mode
0027W
Machine test safety
valve active
Only relevant for commissioning
Contact an authorised service
partner.
0038W
Drag indicator p1 ⇟
Pressure peaks in vacuum network
Check operating conditions
0039W
Drag indicator p2 ⇞
Pressure peaks in compressed air net‐
work
Check operating conditions.
10 Fault Recognition and Rectification
10.3 Interpreting warning messages
162
Service Manual Controller
SIGMA CONTROL 2 BLOWER ≥ 4.0.X
No.: 901700 14 E
