English (GB)
11
6.
The pump performance is
unstable.
a)
Pump inlet pressure is too
low.
Check the inlet conditions of the
pump.
b)
Inlet pipe is partly blocked by
impurities.
Remove and clean the inlet pipe.
c)
Leakage in the inlet pipe.
Remove and repair the inlet pipe.
d)
Air in the inlet pipe or pump.
Vent the inlet pipe or pump.
Check the inlet conditions of the
pump.
7.
The pump runs, but gives
no water.
a)
Pump inlet pressure is too
low.
See 6. a.
b)
The inlet pipe is partly clogged
by impurities.
See 6. b.
c)
The foot or non-return valve is
stuck in its closed position.
Remove and clean, repair or replace
the valve.
d)
Leakage in the inlet pipe.
See 6. c.
e)
Air in the inlet pipe or pump.
See 6. d.
8.
The pump runs backwards
when switched off.
a)
Leakage in the inlet pipe.
See 6. c.
b)
The foot or non-return valve is
defective.
See 7. c.
c)
The foot valve is stuck in
completely or partly open
position.
See 7. c.
9.
The pump runs with
reduced performance.
a)
Wrong direction of rotation.
Three-phase pumps only:
Switch off the power supply with the
external circuit breaker, and
interchange two phases in the pump
terminal box.
b)
See 6. a, b, c, d.
Fault
Cause
Remedy
