9 Malfunctions
CAUTION
Danger of burns on hot surfaces!
In the event of a fault, the surface temperature of the pump can rise to above 105°C.
► Carry out any work on the pump only after cooling to a safe temperature.
► Wear personal protective equipment if necessary.
Danger of property damage from improper maintenance
Pfeiffer Vacuum is not liable for pump damage caused by work being carried out
incorrectly.
● We recommend looking into our service training offering.
● When ordering a replacement part, provide the data from the pump rating plate
where possible.
Should malfunctions occur, you can find information about potential causes and how to fix them here:
Problem
Possible causes
Remedy
Pump will not start up
● No mains voltage or volt-
age does not correspond
to the motor data
● Check the mains voltage and
mains fuse; check the motor switch
if necessary.
● Pump temperature too low
● Check mains voltage and mains
fuse; check motor switch.
● Thermal protection switch
has triggered
● Identify and eliminate the cause;
allow pump to cool if necessary.
● Pumping system contami-
nated
● Clean the pump; contact Pfeiffer
Vacuum if necessary.
● Pumping system damaged
● Clean and service pump; contact
Pfeiffer Vacuum if necessary.
● Motor faulty
● Replace the motor.
Pump switches off after
a while after being start-
ed
● Thermal protection switch
of the motor has triggered
● Identify and eliminate the cause of
the overheating; allow motor to
cool if necessary.
● Mains fuse triggered due to
overload (e.g. cold start)
● Bring pump to permissible ambient
temperature range.
● Exhaust pressure too high
● Check exhaust line outlet opening
and exhaust side accessories.
Pump not reaching
specified end pressure
● Measurement result dis-
torted
● Check measurement instrument,
check ultimate pressure with sys-
tem disconnected.
● Pump or connected acces-
sory contaminated
● Clean the pump and check the
components for pollution.
● Operating fluid contaminat-
ed
● Operate the pump for an extended
period of time with gas ballast
valve open, or change the operat-
ing fluid.
● Operating fluid level too
low
● Refill operating fluid
● Leak in system
● Locate and eliminate the leak.
● Pump is damaged
● Contact Pfeiffer Vacuum service.
Malfunctions
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