10 Malfunctions
CAUTION
Danger of injury from moving parts
After a power failure or a standstill as a result of overheating, the motor restarts automatically. There
is a risk of injury to fingers and hands if they enter the operating range of rotating parts.
► Safely disconnect motor from the mains.
► Secure the motor against reactivation.
► Dismantle the vacuum pump for inspection, away from the system if necessary.
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.
Should malfunctions occur, you can find information about potential causes and how to fix them here:
Problem
Possible causes
Remedy
Vacuum pump will not start up
● No supply voltage or
voltage does not corre-
spond to the motor da-
ta
● Check the supply voltage.
● Pump temperature too
low
● Heat the vacuum pump to a tem-
perature of > 10 °C.
● Thermal protection of
the motor has triggered
● Identify and eliminate the cause
and allow vacuum pump to cool if
necessary.
● Phase failure
● Check the mains fuse.
● Replace defective mains fuse.
● Diaphragms or valves
dirty
● Clean the vacuum pump.
● Overpressure in the ex-
haust line
● Check and clean exhaust line as
required.
● Fuse failure
● Check the mains fuse.
● Replace defective mains fuse.
Vacuum pump switches off af-
ter a while after being started
● Thermal protection of
the motor has triggered
● Identify and eliminate the cause
and allow vacuum pump to cool if
necessary.
● Mains fuse protection
triggered due to over-
load (e.g. cold start)
● Heat up the vacuum pump.
● Exhaust pressure too
high
● Check exhaust line outlet open-
ing and exhaust side accesso-
ries.
Malfunctions
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