Faults
04/2019
EN 33
Fault
: Pump is loud
Possible cause
Solution
Pump and pipes not
completely ventilated or
filled.
Ventilate
pump.
Fill
pump.
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.
If the resistance is too large,
modify the intake line.
Check
suction
basket/suction
opening.
Observe the permitted pressure
reduction speed.
Wear of components.
Replace
components.
Dynamic head lower than
that indicated in the
order.
Set operating point exactly.
For constant overload turn the
impeller (further enquiry
required).
Pump strained or
vibrations in the pipes.
Check pipe connections and
pump fasteners, if necessary
reduce the pipe bracket
spacing.
Fasten pipes using vibration
reducing materials.
Imbalanced rotor.
Clean pump and pump parts.
Pump and/or motor
bearings are damaged.
Replace
bearing.
Flow rate too low.
Increase minimum flow rate.
