English
12
Wilo AG 05/2006
10 Problems, causes and remedies
If no solution can be found, please contact your
plumbing and heating specialist or your nearest
Wilo Customer Service or representative.
11 Spare parts
Spare parts are ordered via a local specialist dealer
and/or Wilo customer service.
In order to avoid queries and incorrect orders,
make sure to mention all data indicated on the
rating plate when placing your order.
Subject to technical alterations!
Problems
Causes
Remedy
Pump does not run
Interruption of the current, short circuit.
Insulation fault in the motor winding.
Check power supply,.
Call on expert to check cable and motor.
Safety fuse, capacitor defect.
Replace fuses, capacitor
Cable break.
Check cable resistance. If necessary, replace
cable. Only use original Wilo special cable!
Level switch does not switch.
Check level switch.
Protective motor switch
engaged
Protective motor switch not set correctly.
Switch to nominal current.
Cutting device or impeller already blocked by
foreign bodies.
• Switch off the pump voltage and secure against
re-operation.
• Close the shut-off valve at the back of the
pump.
• Remove pump from the sump.
• Remove foreign bodies from the pump.
Pump does not pump
Air in spiral housing.
Ventilate backflow preventer.
Level switch not set correctly.
Ensure that the suction impeller is flooded.
Pump transports too little, Wrong direction of rotation.
interchange two phases of the mains connection.
noisy operation
Impeller worn down.
Change impeller.
Impeller, cutting device or pump housing cov-
ered in sludge.
Clean pump, see sixth line.
