12 Malfunctions
12.1 General
WARNING
Danger to life from electric shock in the event of a fault
In the event of a fault, devices connected to the mains may be live. There is a danger to life from
electric shock when making contact with live components.
► Always keep the mains connection freely accessible so you can disconnect it at any time.
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.
No automatic restart following a power failure or error state
After restoring the power supply, the vacuum pump remains in the "Switched Off" state.
● Switch the vacuum pump on actively.
Vacuum pump and electronic drive unit malfunctions always result in a warning or error message. In
both cases, you will receive an error code that you can read out via the interfaces of the electronic drive
unit. Generally, the LEDs on the control panel display the operating messages. If an error occurs, switch
off the vacuum pump and connected devices.
12.2 Troubleshooting
Should malfunctions occur, you can find information about potential causes and how to fix them here:
Problem
Possible causes
Remedy
The vacuum pump does not start up
and no LED lights up on the opera-
tor panel of the electronic drive unit
● No mains voltage or operating
voltage incorrect
● Check the mains voltage.
● Check the mains fuse.
● Electronic drive unit defective
● Contact Pfeiffer Vacuum Service.
Vacuum pump will not start up
● Suction chamber dirty
● Switch off the vacuum pump immedi-
ately.
● Clean suction chamber.
● If necessary, contact Pfeiffer Vacuum
Service.
Vacuum pump switches off after a
while after being started
● Thermal protection switch of the
motor or the vacuum pump has
triggered
● Thermal protection switch of the
motor and/or the oil temperature
sensors of the vacuum pump have
triggered
● Determine the cause and eliminate
the fault.
● Allow the vacuum pump or the motor
to cool as necessary.
● Observe the intended use.
Vacuum pump/pumping station
does not reach ultimate pressure
● Backing pump faulty
● Check the backing pump.
● Leak in system
● Examine the system for leaks and, if
necessary, carry out a leak test.
● Eliminate leaks.
● Check the calibration of the measure-
ment instruments.
● Check if auxiliary gases such as seal-
ing gas and/or gas ballast are allowed
to enter the vacuum pump.
● Condensate and/or other outgas-
sing impurities in the operation flu-
id
● Replace the lubricant.
Malfunctions
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