10 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 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 data
● Check the supply voltage.
● Pump temperature too
low
● Heat the vacuum pump to a tem-
perature of > 12 °C.
● Thermal protection of
the motor has triggered
● Identify and eliminate the cause
and allow vacuum pump to cool if
necessary.
● Diaphragms or valves
dirty
● Clean the vacuum pump.
● Overpressure in the ex-
haust lead
● If required, check and clean the
exhaust line.
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.
● Exhaust pressure too
high
● Check exhaust line outlet open-
ing and exhaust side accesso-
ries.
Vacuum pump does not reach
the specified ultimate pres-
sure
● Condensate in the vac-
uum pump
● Operate the vacuum pump at at-
mospheric pressure for a longer
period.
● Flushing gas nozzle
open
● Close the flushing gas nozzle
● Soiled valves or dia-
phragms
● If necessary, clean or replace the
valves and diaphragms.
● Leak in system
● Locate and eliminate the leak.
Pumping speed of vacuum
pump too low
● The intake line is not
suitably dimensioned
● Make sure that connections are
short and cross sections ade-
quately dimensioned.
● Exhaust pressure too
high
● Check exhaust line outlet open-
ing and exhaust side accesso-
ries.
Malfunctions
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