Faults
30 EN 04/2019
Fault: Too low a flow rate in the pump
Possible cause Solution
Pump is handling against
too high a discharge
head.
Set operating point again.
Check unit for impurities.
Pump and pipes not
completely ventilated or
filled.
Ventilate pump.
Fill pump.
Pump/pump parts
blocked due to
impurities.
Clean.
Building up of air sacks
in the piping.
Modify piping or insert a
ventilation valve.
Suction height too
large/Unit’s NPSH
(intake) too low.
Correct the fluid level.
Install pump lower.
Completely open shut-off valve
in the intake li
ne.
If the resistance is too large,
modify the intake line
.
Check suction basket/suction
opening.
Observe the permitted pressure
reduction speed.
Drawing in air in the
mechanical seal.
Replace mechanical seal.
Incorrect direction of
rotation (3~).
Check the electrical connection
to the motor and switchin
g
device.
Too low a speed.
Increase the voltage/frequency
on the frequency converter
within the permitted range.
Wear of components. Replace components.
Running on two phases. Renew faulty fuse.
Check the electrical connections
using the operating manual.
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