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8. Fault finding chart
Before starting work on the pump/unit, make sure that the electricity supply has been
switched off and that it cannot be accidentally switched on.
Fault
1. The pump does
not start.
2. The green
indicator light is
on, but the pump
does not start
when water is
consumed.
3. Frequent starts
and stops.
4. The pump does
not stop.
5. The red
indicator light
is on.
9. 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) The fuses in the electric installation
are blown.
b) The ELCB or the voltage-operated
ELCB has tripped out.
c) No electricity supply.
d) The motor protection has cut off the
electricity supply due to overload.
e) The pump is defective.
a) Too high system pressure.
b) Too big distance of height between
the unit and the draw-off point.
a) Leakage in the pipework.
b) Non-return valve or foot valve
leaking.
a) The pump is not capable of
delivering the required discharge
pressure.
b) The unit is defective.
a) No water available at the pump
suction port.
b) The pump starts to self-prime
(jet pumps only).
c) The pump or unit is defective.
Remedy
Replace the fuses. If the new ones blow
too, the electric installation should be
checked.
Cut in the circuit breaker.
Contact the electricity supply authorities.
Check whether the motor/pump is
blocked.
Repair or replace the pump.
Reduce the pressure.
Adapt the installation.
Check and repair the pipework.
Replace the non-return valve or foot
valve.
Replace the pump.
Replace the unit.
Check the pipework.
See section 5. Start-up.
Replace the pump or unit.
Subject to alterations.
9
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