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12
5. The pump does not
stop.
a) The pump cannot deliver the
necessary outlet pressure.
Replace the pump.
b) A PM unit with too high start
pressure is installed.
Select a PM unit with a lower start
pressure.
c) The PM unit is defective. Repair or replace the PM unit.
d) The non-return valve is stuck in
open position.
Clean or replace the non-return valve.
6. The red "Alarm"
indicator light is
permanently on.
a) Dry running. The pump needs water. Check the pipes.
b) The power supply to the pump is
disconnected after the PM unit.
Check the plug and cable connections,
and check if the built-in circuit breaker
of the pump is switched off.
c) The motor protection of the pump
has tripped due to overload.
Check if the motor/pump is blocked.
d) The pump is defective. Repair or replace the pump.
e) The PM unit is defective. Repair or replace the PM unit.
7. The red "Alarm"
indicator light is
flashing.
a) Cycling. A tap has not been closed
entirely after use. Check that all taps have been closed.
8. The pump
performance is
unstable.
a) Pump inlet pressure is too low. Check the inlet conditions of the pump.
b) The 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.
9. The pump runs
backwards when
switched off.
a) Leakage in the inlet pipe. Remove and repair the inlet pipe.
b) The foot or non-return valve is
defective.
Remove and clean, repair or replace
the valve.
c) The foot valve is stuck in completely
or partly open position.
Remove and clean, repair or replace
the valve.
Self-priming pumps only:
10. The pump
performance is
unstable and the
pump is noisy.
a) The differential pressure across the
pump is too low.
Close the tap gradually until the outlet
pressure is stable and the noise has
ceased.
11. When startup is
attempted, the
pump starts, but
delivers no
pressure or flow.
a) Liquid column above non-return
valve in the outlet pipe prevents the
pump from self-priming.
Empty the outlet pipe. Make sure that
the non-return valve does not hold back
liquid in the outlet pipe. Repeat the
startup procedure.
b) The inlet pipe draws in air. Make sure that the inlet pipe is airtight
from pump to liquid level. Repeat the
startup procedure.
12. The pump runs, but
does not deliver
the rated flow rate.
a) The internal valve did not close. Close the tap gradually until the
pressure or flow suddenly increases.
Then open the tap gradually until the
required flow is reached.
13. The pump
performance is
unstable.
a) Pump inlet pressure is too low. Check the inlet conditions of the pump.
b) The 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.
Fault Cause Remedy
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