Troubleshooting
25300758785_001_C1 - 06/2019 - © Leybold
Malfunction Error
message
Error
code
(MODBUS)
Brief Des-
cription
Likely cause Remedy
End pressure will
not be reached.
–
– Gas ballast valve open Close gas ballast valve, if possible.
Leakage in the system Check for leak.
Gas ballast valve defective Check for leak.
Replace gas ballast valve – please
send us your enquiry.
Outlet blocked
Unacceptably high back pres-
sure in outlet
Ensure the pump outlet is clear.
Ensure that outlet pressure does
not exceed 1200 mbar.
Pump does not run at the
rated rotational speed of 210
Hz.
Set target speed of 210 Hz (using
X104 RS-485 interface).
Contact Leybold Service.
Error message in
the display
SEr
Service
Alarm
Pump service countdown has
expired.
Pump service required.
ocA
ocd
ocn
1
2
3
Overcurrent Short circuit or earthing fault
on the output side of the fre-
quency converter
Contact Leybold Service.
Pump is
extremely loud.
–
– Bearing defective Contact Leybold Service.
Pump switches
off
oH 1
oH 3
16
24
Heatsink
Overheat
Ambient temperature too high Set the pump up at a suitable
location with a lower ambient tem-
perature.
Cooling air supply or discharge
impeded
Ensure sufficient cooling air supply
or discharge.
Ventilator defective Contact Leybold Service.
Pump cooling fins blocked by
dirt
Contact Leybold Service.
Gas temperature too high Check the system.
Pump switches
off
oL
EoL 1
21
22
Motor
Overload
Bearing defective Contact Leybold Service.
Foreign bodies, particles or
process deposits are blocking
the rotor.
Contact Leybold Service.
Pump switches
off
Lun
13 DC Under-
voltage
The voltage on the DC bus fell
for longer than two seconds.
(The power supply dropped or
is too weak.)
Check the power supply.
Ensure that the power supply is
sufficiently strong.
Remove the pump from the mains
supply for at least 10 seconds and
restart.
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