Faults
04/2019
EN 31
Fault
: Increased bearing temperature
Possible cause
Solution
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.
Increased axial thrust –
(further enquiry
required).
Clean relief bore in impeller.
Flow rate too low.
Increase minimum flow rate.
Fault
: Unauthorised increase in pump temperature
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.
Flow rate too low.
Increase minimum flow rate.
