Message Possible cause Remedy
mains voltage ↓ 1. Power supply failure:
Machine was re-started automati‐
cally.
Check power supply.
Check the door interlock switch.
OS dp↑ The pressure drop across the oil
separator cartridge has risen.
Oil separator cartridge clogged.
Change the oil separator cartridge.
OS h⇞ The oil separator cartridge change
interval has expired.
Change the oil separator cartridge.
oil filter dp ↑ The pressure drop across the oil fil‐
ter has risen.
Oil filter clogged.
Change the oil filter.
oil level ↓ Cooling oil level too low. Top up the cooling oil.
oil T↓ Cooling oil temperature too low. Check temperature switch, line and con‐
nection.
Check the oil circulation.
Increase room temperature.
oil change h⇞ The interval for the oil change has
expired.
Change the cooling oil.
oil filter h⇞ The oil filter change interval has ex‐
pired.
Change the oil filter.
p-switch Customer specific:
no details possible.
–
buffer battery Data retention battery is almost dis‐
charged.
Change the battery.
oil content ↑ The oil content limit for pure air will
soon be reached.
Check the scavenge tube in the oil separa‐
tor cartridge.
Check the dirt trap strainer in the scavenge
line.
Check air treatment upstream of the meas‐
uring point.
V-belt tension Belt tension is too low. Re-tension drive belts.
blt.coup.insp.h⇞ The belt tension / coupling inspec‐
tion interval has expired.
Carry out a visual check.
Re-tension drive belts.
blt.coup.insp.h⇞ The belts/coupling change interval
has expired.
Drive belts:
Check drive belts.
Coupling:
Call KAESER Service.
start T↓ The airend temperature is too low (<
+37 °F).
Keep ambient conditions within specified
limits.
start T↓↓ The airend temperature is too low
(<14 °F) for the machine to be op‐
erated.
Keep ambient conditions within specified
limits.
T-switch Customer specific:
no details possible.
–
9 Fault Recognition and Rectification
9.3 Warning messages (yellow LED lights)
9_5708 08 USE
Service Manual Screw Compressor
BSD
59
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