Fault
code
Symbol Meaning Remedy
4 Maximum permissible airend dis‐
charge temperature exceeded.
➤ Clean the radiator.
➤ 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 – Reserve –
Tab. 49 Alarm indications
9.3 Warning messages
The fault code appears in the 4th line of the display field.
An adhesive label at the machine explains the fault code using symbols.
Fault
code
Symbol Meaning Remedy
S Maintenance counter has elapsed. ➤ Carry out maintenance.
p Back pressure present. ➤ Check direction of drive motor ro‐
tation.
T Machine below minimum permissi‐
ble starting temperature.
➤ Increase room temperature.
i Pressure relief valve check mode
switched on.
➤ Check pressure relief valve.
➤ Deactivate check mode.
Tab. 50 Warning messages
9 Fault Recognition and Rectification
9.3 Warning messages
9_5717 20 E
Service Manual Screw Compressor
ASK T SIGMA CONTROL BASIC
57
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