Fault Finding Chart - Grundfos Sololift+ PWC-3 Montage- Und Betriebsanleitung

6. Fault finding chart

Before starting work on the pump, make sure that the fuse has been removed, the plug has
been pulled out of the socket or the electricity supply has been switched off. Make sure that
the electricity supply cannot be accidentally switched on.
All rotating parts must have stopped moving.
Any repairs to the motor and electric components must only be performed by trained service
personnel.
Fault
1. Motor does not operate when
tank is filled above start
level.
2. Motor hums, but does not
operate.
3. Motor operates continuously
or at regular intervals.
4. Motor runs, but does not
evacuate water.
5. Sololift+ evacuates slowly.
6. Rattling noise from Sololift+,
but waste is cleared.
7. Odour from the tank.
12
Cause
a) Electrical supply failure.
b) Fuse blown.
If new fuse blows at once, either
cable or motor is faulty.
c) Obstruction; thermal overload
switch tripped.
d) Level switch defective.
a) Impeller obstructed.
b) Motor/capacitor defective.
a) Water leaking from inlet into
unit.
b) Water leaking back into unit
from discharge pipe.
c) Level switch defective.
a) Pump blocked.
b) Air in pump.
c) Internal blockage in discharge.
d) Blockage in discharge pipe.
a) Strainer blocked.
b) Air ventilation blocked.
c) Discharge pipe work inserted
too far into discharge elbow.
d) Discharge pipe is too long or
has an excessive number of
bends.
e) The pump housing is leaky.
a) Solid obstruction hitting impeller
or cutter knife.
a) Carbon filter contaminated.
Remedy
Check electrical supply.
Replace fuse.
Measure cable and motor. If cable
or motor is defective, replace the
lifting station.
Remove obstruction and wait
3-5 minutes until thermal overload
switch has reset.
Replace the lifting station.
Remove obstruction and check for
free rotation.
Replace the lifting station.
Check for leaking taps/cistern.
Check internal non-return valve.
Replace the lifting station.
Clear obstruction.
Check tank vent valve is clear.
Check that carbon filter is not wet.
Check air bleed hole of pump
discharge is not blocked.
Clear obstruction.
Check non-return valve is clear.
Clear obstruction.
Remove and clean strainer.
Check operation of vent valve.
Check that carbon filter is not wet.
Check air bleed hole of pump
discharge is not blocked.
Reduce length of discharge pipe
inserted into discharge elbow.
Increase discharge pipe size
(maximum 32 mm).
Change pipework to reduce number
of bends.
Change bends to swept bends.
Replace the lifting station.
Remove obstruction.
Replace carbon filter.