Fault
code
Sign
Meaning
Remedy
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 tempera‐
ture of the controller housing ex‐
ceeded.
➤ Ensure adequate ventilation.
➤ Ensure that the permissible room tem‐
perature is not exceeded.
Tab. 37 Fault messages and remedies
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
Safety relief valve check mode
switched on.
➤ Check safety relief valve.
➤ Deactivate check mode.
Tab. 38 Warning messages
9
Fault Recognition and Rectification
9.3
Warning messages
54
Operator Manual Screw Compressor
AIRTOWER 3C–7.5C Tri-Voltage
9_6917 34 USE