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14 WILO SE 03/2009
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 spe-
cial 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
covered in sludge
Clean pump, see sixth line
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