Fault
code
Sign
Meaning
Action
4
Maximum permissible airend dis‐
charge temperature exceeded.
➤ Clean the cooler.
➤ Maintain sufficient distance between
the cooling air inlet and exhaust
openings and any wall. Check the
cooling oil level.
➤ Ensure that the permissible room
temperature is not exceeded.
➤ Change the oil filter.
5
Fault in the refrigeration dryer.
➤ Clean the refrigerant condenser.
➤ Ensure adequate ventilation.
➤ Install an extractor fan.
6
Defective analog input (pressure or
temperature sensor).
➤ Check lines and connections.
7
Maximum permissible temperature of
the controller housing exceeded.
➤ Ensure adequate ventilation.
➤ Ensure that the permissible room
temperature is not exceeded.
8
–
Spare.
–
Tab. 32 Alarm messages
9.3 Warning messages
The error code appears in the 4th line of the display field.
A sticker with symbols on the machine explains the error code.
Fault
code
Sign
Meaning
Action
S
Maintenance interval has elapsed.
➤ Carry out maintenance.
p
Back pressure present.
➤ Check direction of drive motor ro‐
tation.
T
Machine below minimum permissible
starting temperature.
➤ Increase room temperature.
i
Pressure relief valve check mode
switched on.
➤ Check pressure relief valve.
➤ Deactivate check mode.
Tab. 33 Warning messages
9
Fault Recognition and Rectification
9.3
Warning messages
Number: 9_6945 01USE
Service manual Screw compressor
Aircenter SX 3/7.5 SIGMA CONTROL BASIC
51
