9 Malfunctions
CAUTION
Danger of burns on hot surfaces
In the event of a fault, the surface temperature of the vacuum pump can increase to above 105°C.
► Allow the vacuum pump to cool down before working on it.
► Wear personal protective equipment if necessary.
NOTICE
Danger of property damage from improper maintenance
Unprofessional work on the vacuum pump will lead to damage for which Pfeiffer Vacuum accepts no
liability.
► We recommend taking advantage of our service training offering.
► When ordering a replacement part, provide the data from the pump rating plate where possible.
Problem
Possible causes
Remedy
Vacuum pump will not start
up
● Mains voltage is miss-
ing or the incorrect
operating voltage is
present
1. Check the mains voltage.
2. Check the mains fuse.
3. Check the motor switch.
● Thermal protection
switch has triggered
1. Determine the cause and eliminate
the fault.
2. Allow the vacuum pump to cool if
needed.
● Suction chamber con-
taminated
1. Clean suction chamber.
2. If necessary, contact Pfeiffer Vacuum
Service.
● Gear (gear wheels)
damaged
1. Switch off the vacuum pump immedi-
ately.
2. If necessary, contact Pfeiffer Vacuum
Service.
● Bearing damage
present
1. Have the bearing changed.
2. Contact Pfeiffer Vacuum Service.
● Motor faulty
1. Change the motor.
Vacuum pump switches off
after a while after being
started
● Thermal protection
switch of the motor
has triggered
1. Determine the cause of the overheat-
ing and eliminate the fault.
2. Allow the motor to cool if necessary
Vacuum pump/pumping
station does not reach ulti-
mate pressure
● Suction chamber dirty
1. Clean suction chamber
● Lubricant soiled
1. Change the lubricant
● Backing pump oper-
ates incorrectly
1. Check the backing pump
● Leak in system
1. Examine the system for leaks and, if
necessary, carry out a leak test.
2. Eliminate leaks.
● Escaping lubricant at
the radial shaft seal
rings or on the axial
face seal
1. Check the radial shaft seal rings or
the axial face seal.
2. Have the seals affected replaced, if
necessary.
3. If necessary, contact Pfeiffer Vacuum
Service.
Malfunctions
47/56
