BE3350
Edition
11/2019
Page 7 of 10
9
Trouble shooter’s guide
Fault
Cause
Remedy
Motor does not start, no motor
noise
At least two of the power supply
leads have failed
Overload has tripped
Check fuses, terminals and supply
leads.
Inspect overload
Motor does not start, humming noise
One of the supply leads has failed
Impeller faulty
Motor bearing faulty
See above
Replace impeller
Replace bearing
Overload trips
Pump locked up mechanically
High on/of cycling frequency
Inspect pump hydraulics
Check application
Power consumption is too high
Wrong direction of rotation of
impeller
Lime or other deposits
mechanical friction
See above
Clean pump mechanism
repair pump
Motor overheats
High on/off cycling frequency
Wrong power supply (voltage or
cycles)
Insufficient cooling
See above
Power supply must correspond with
name plate rating
Check air flow at motor fan
Pump does not pump
liquid level too low
Pump mechanism faulty
Pipe blocked
Fill up liquid
replace pump mechanism
Clean pipe
Insufficient flow and pressure
Wrong direction of rotation of
impeller
Pump mechanism silted up
Worn pump mechanism
Change over two power supply
leads
Clean pump mechanism
Replace pump mechanism
Incorrect flow or pressure
Wrong power supply (voltage or
cycles)
Power supply must correspond with
name plate rating
Running noise/Vibration
Foreign objects in pump end
Impeller damaged
Bearing/Bushing broken
Remove foreign objects
Replace impeller
Replace bearing/bushing
