Fault Finding Chart; Disposal - Grundfos JP Series Installation And Operating Instructions Manual

9. Fault finding chart

Warning
Before starting work on the pump, make sure that the power supply has been switched off.
It must be ensured that the power supply cannot be accidentally switched on.
Fault
1. The pump does not start.
2. The pump runs, but gives no
water or delivers a reduced
quantity of water and
pressure.
3. The motor cuts out during
operation.

10. Disposal

This product or parts of it must be disposed of in an
environmentally sound way:
1. Use the public or private waste collection service.
2. If this is not possible, contact the nearest
Grundfos company or service workshop.
Cause
a) Supply failure.
b) Pump blocked by impurities.
c) Motor defective.
a) Pump not filled with water.
b) Suction or discharge pipe blocked by impurities.
c) Pump blocked by impurities.
d) Suction lift too high (over 8 metres).
e) Suction pipe too long.
f) Diameter of suction pipe too small.
g) Suction pipe inlet not covered by water.
h) Suction pipe leaking.
i) Ejector valve setting incorrect (only pumps with ejector valve).
j) Direction of rotation incorrect (three-phase pumps).
a) Single-phase motors:
Thermal switch in motor cuts out due to overheating.
b) Three-phase motors:
External motor protection cuts out.
Subject to alterations.
9