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