10 Malfunctions
DANGER
Danger to life from electric shock
Touching exposed and voltage-bearing elements causes an electric shock. Improper connection of
the mains supply leads to the risk of touchable live housing parts. There is a risk to life.
► Before the installation, check that the connection leads are voltage-free.
► Make sure that electrical installations are only carried out by qualified electricians.
► Provide adequate grounding for the device.
► After connection work, carry out an earthed conductor check.
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 carrying out any work.
► 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 spare parts, specify the information on the nameplate.
Problem
Possible causes
Remedy
Vacuum pump will not
start
● No mains voltage or operat-
ing voltage incorrect
● Check the mains voltage.
● Check the mains fuse.
● Check the motor switch.
● Thermal protection switch
has tripped
● Determine the cause and eliminate
the fault.
● Allow the vacuum pump to cool if
needed.
● Pump system corroded from
the inside or condensate
present
● Check the process and pump medi-
um
● Install a condensate collector.
● Contact Pfeiffer Vacuum Service.
● Motor seized
● Check the motor.
● Try to turn over the motor by hand
with the power supply disconnected.
● Motor faulty
● Change the motor and check the
new motor.
● Foreign particles in the suc-
tion chamber
● Remove the foreign particles.
● If the vacuum pump is seized, notify
Pfeiffer Vacuum Service.
● Inspect the intake strainer.
● Rotors jammed or seized
● Rotate the screw rotors by hand us-
ing the rotor access screw
● Have the vacuum pump repaired.
Contact Pfeiffer Vacuum Service.
Loud noises during
operation
● Gears, bearings or coupling
elements are faulty
● Have the vacuum pump repaired.
● Contact Pfeiffer Vacuum Service.
● Incorrect or unsuitable lubri-
cant
● Use a suitable lubricant.
Malfunctions
55/70
