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34 WILO AG 11/2007
10 Faults, causes and remedies
Faults may only be repaired by qualified personnel!
If the malfunction cannot be rectified, call a specialist or the nearest Wilo agent or
after-sales support.
11 Spare parts
Spare parts can be ordered from local specialists or Wilo after-sales service.
To prevent queries or faulty orders, please state all the information on the name plate when
ordering.
Subject to change without prior notice
Fault Cause Remedy
Unit will not start,
Water remains in
toilet bowl.
Power failure. Check mains voltage.
Faulty fuse. Replace fuse.
Mains cable damaged. Attention! The special cable may only be
replaced by after-sales service or a qualified
electrician.
Unit overloaded; motor shut down. Unit switches on again after cooling down,
avoid overload if possible.
Motor defective. Have after-sales service replace pump unit.
Impeller blocked. See 9.1
Water only drains very slowly from
the toilet bowl.
Obstruction in siphon of toilet bowl.
Obstruction in front of tank in toilet inlet.
Check the amount of water for flushing in
the toilet cistern and set it to 9 litres or the
maximum quantity. If more water than usual
remains in the toilet bowl, flush again and
repeat as long as it is pumped out.
Obstruction in pump suction opening due to
too much paper and not enough water.
See 9.1
Delivery head too high. See 7.1.3, pressure pipe.
Pump switches on frequently
after normal delivery.
Cistern valve leaks, water constantly flows
through the toilet bowl to the unit.
Check the cistern valve.
Leaky or defective non-return valve; after
pumping water returns from the pressure
pipe to the unit.
Check the non-return valve; if there is no
backflow in the toilet bowl, flush at intervals
several times.
Obstruction in the tank in front of the pump,
so that water is only pumped out at short
intervals.
See 9.1
Defective level switch on the unit. Call after-sales service.
Noisy operation.
Foreign matter in the pump. See 9.1
Unit alarm sounds. Running time too long (pressure pipe or
pump inlet opening blocked).
See 9.1
Water level in tank too high (pump blocked
or obstructed).
See 9.1
Water level in tank too high (level switch
defective).
Call after-sales service.
Occasional obstructions, no
audible sipping mode.
No homogenisation of fluid. Call after-sales service.
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