En
gl
is
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8
6. 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)
The pump is blocked by
impurities.
Clean the pump. Check or replace the strainer
in the inlet pipe.
c)
The motor is defective.
Replace the pump.
2.
The pump runs,
but gives no or just
a little water.
a)
Pump is not filled with water.
Prime the pump. See section
b)
The inlet pipe is blocked by
impurities.
Clean the pump. Check or replace the strainer
in the inlet pipe.
c)
The pump is blocked by
impurities.
Clean the pump. Check or replace the strainer
in the inlet pipe.
d)
The suction lift is too high
(over 7 metres).
Change the position of the pump.
e)
The inlet pipe is too long.
Change the position of the pump.
f)
Diameter of inlet pipe is too
small.
Replace the inlet pipe.
g)
The inlet pipe is not immersed
deeply enough.
Make sure that the inlet pipe is immersed
sufficiently.
h)
The inlet pipe is leaking.
Repair or replace the pipe.
3. The pump runs, but
gives no water or
delivers a reduced
quantity of water at
high pressure.
a)
The discharge pipe is
blocked.
Clean pipe or open isolating valves, if fitted.
Check that no additional work is being carried
out in the system.
4.
The motor cuts out
during operation.
a)
Single-phase motors:
The thermal switch in the
motor has tripped due to
overheating.
The thermal switch will cut in automatically
when the motor has cooled sufficiently.
If the problem still persists, check these two
possible causes:
• Impeller stuck.
Clean the pump.
• Motor defective.
Replace the pump.
