16
PROBLEM
POSSIBLE CAUSE
SOLUTION
The inlet pipe is too small
Increase the inlet pipe
At the pump inlet, there is not
enough water
Increase water or switch off until
correct level is attained
Inlet pressure is too small compared
to water temperature, pipe loss and
flow
Improve the system, increase inlet
pressure
Part of pipe is clogged
Check and clean
Uneven water
flow
Pump rotating in wrong direction
Inlet pipe, filter, bottom valve or
pump body is clogged
Clean the pipe, bottom valve, filter
or pump body to remove debris
Incorrect model selection
Select the suitable model
The pump is
running but the
water output is
l o w a n d t h e
pressure
insufficient
Correct motor rotation by changing
any two cables
Low motor voltage or the wire is too
long
Check the motor voltage or increase
the wire cross section
Impeller worn out
Replace the impeller
Mechanical seal leaking
Clean or replace mechanical seals
Outlet pipe leak
Check and repair the outlet pipe
