42 GA01208_002_C0 - 11/2016 - © Leybold
Troubleshooting
6 Troubleshooting
Fault
Pump does not start.
Pump does not reach ultimate
pressure.
Pumping speed is too low.
After switching off the pump
under vacuum, pressure in the
system rises too fast.
Possible cause Remedy Repair*
Wiring is malfunctioning. Check and repair wiring. -
Motor protection switch incorrectly set Set motor protection switch properly. 3.4
(three-phase motors only).
Operating voltage does not match Replace the motor. 5.7
motor.
Motor is malfunctioning. Replace the motor. 5.7
Oil temperature is below 12 °C. Heat the pump and pump oil or use
a different oil. 4.3.3/5.4
Oil is too thick. Change the oil. 5.4
Exhaust filter/exhaust line is clogged. Replace the filter or clean the exhaust line. -
Pump is seized up
(sign: pump is jammed). Repair the pump. Service
Measuring technique or gauge Use correct measuring technique and gauge.
is unsuitable. Measure the pressure directly at the
pump’s intake port. -
External leak
1)
. Repair the pump. Service
Anti-suckback valve is malfunctioning. Repair the valve. Service
Exhaust valve is malfunctioning. Repair the valve. Service
Oil is unsuitable. Change the oil (degas it, if necessary). 5.4
Vacuum lines are dirty. Clean the vacuum lines. -
Pump is too small. Check the process data, replace the
pump, if necessary. -
Inlet screen in the intake port is Clean the inlet screen. 5.5
clogged. Precaution: install a dust filter in the
intake line.
Exhaust filter is clogged. Install new filter element. -
Connecting lines are too narrow Use adequately wide and short
or too long. connecting lines. 3.3
System has a leak. Check the system. -
Anti-suckback valve is malfunctioning. Repair the valve. Service
* Repair: Refer to the stated section in these Operating Instructions.
1) Bubble test: The warm pump with degassed oil is running without gas ballast and the intake is blanked off. The exhaust line is
led into a vessel with water.
If an evenly spaced line of bubbles appears then the pump has an external leak.
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