23
Movitec V 2,4,6,10,15 & 90
Pump supplies insufficient
capacity and/or pressure
Outlet and/or inlet shut-off
valve is closed
Open both shut-off valves
There is air in the pump
Vent the pump
The suction pressure is
insufficient
Increase the suction pres-
sure
Pump rotates in the wrong
direction
Change over L1 and L2 of
the three phase supply.
The suction line has not
been vented
Vent the suction line
Air bubble in the suction
line
Install the suction line with
pump end higher than the
other end
Pump sucks air because
of leakage in the suction
line
Repair the leakage
Too little water consump-
tion so air bubbles clog up
in the pump
Make sure the consump-
tion increases or use a
smaller pump
The diameter of the suc-
tion line is too small
Increase the diameter of
the suction line
Capacity of water meter in
the supply line is too small
Increase the capacity of
the water meter
Foot valve blocked
Clean the foot valve
The impeller or the diffuser
is blocked
Clean the inside of the
pump
O-ring between impeller
and diffuser is gone
Replace the O-rings
O-ring not resistant to the
medium to be pumped
Replace O-ring by an O-
ring with better resistance
Problem
Possible cause
Possible solution
Checkpoints
Goodnal STP ST041 Disinfection & Outfall (KSB Service Water Pumps Pu-1030-010/020/030 OM Instructions) Vendor Manual
Q-Pulse Id VM404
Active 29/10/2013
Page 25 of 42
