English (GB)
11
9. The pump runs, but does not deliver
the rated flow.
Self-priming pumps only:
a) Internal valve does not close.
Close the tap gradually until a sudden rise in
pressure or flow can be seen. Then open the
tap gradually until the required flow is reached.
10. The pump runs backwards when
switched off.
a) Leakage in suction pipe.
See 5. c).
b) Foot or non-return valve are defective.
See 6. c).
c) Foot valve is stuck in completely or
partly open position.
See 6. c).
11. 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.
a) See 5. a), b), c), d).
Fault
Cause
Remedy
