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12
10. Fault finding
Warning
Before starting fault finding, switch off
the power supply. Make sure that the
power supply cannot be accidentally
switched on.
Fault
Cause
Remedy
1.
The pump does
not start.
a)
Supply failure.
Cut in the circuit breaker or replace the fuses.
If the new fuses also blow, check the electric
installation.
b)
Pump blocked by impurities.
Clean the pump. Check or replace the strainer
in the suction pipe.
c)
Motor defective.
Repair or replace the motor. *
d)
Three-phase motors:
The motor-protective circuit
breaker has tripped.
Cut in the motor-protective circuit breaker.
If the problem still persists, check these two
possible causes:
• Impeller stuck.
Clean the pump according to section
.
• Motor defective.
Repair or replace the motor. *
2.
The pump runs,
but gives no water
or delivers a
reduced quantity
of water.
a)
Pump is not filled with water.
Prime the pump. See section
b)
Suction pipe blocked by
impurities.
Clean the pump. Check or replace the strainer
in the suction pipe.
c)
Pump blocked by impurities.
Clean the pump. Check or replace the strainer
in the suction pipe.
d)
Suction lift is too high (over 7
metres).
Change the position of the pump.
e)
Suction pipe is too long.
Change the position of the pump.
f)
Diameter of suction pipe is
too small.
Replace the suction pipe.
g)
Suction pipe is not immersed
deeply enough.
Make sure that the suction pipe is immersed
sufficiently.
h)
Suction pipe is leaking.
Repair or replace the pipe.
i)
Ejector valve setting is
incorrect (only pumps fitted
with ejector valve).
Set the valve. See section
j)
Direction of rotation is
incorrect (three-phase
pumps).
Interchange two phases.
3. The pump runs, but
gives no water or
delivers a reduced
quantity of water at
high pressure.
a)
Discharge pipe blocked.
Clean pipe or open isolating valves, if fitted.
Check that no additional work is being carried
out in the system.
