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8 Problems, Causes and Solutions
Problem Cause Solution
Motor does not run No supply voltage Check main fuse, FI switch and supply cable
Fuse defect Change fuse and, if necessary, eliminate cause of
fuse blow
Overload switch Temp. of flow medium to high, keep with in the
triggered on permissible temperature range. If the event of
reoccurrence, contact customer service.
Pump blocked, contact customer service
Overload switch
triggered on
Booster relay defect contact customer service
Motor defect contact customer service
Motor runs, pump Pressure pipeline blocked Remove blockage or brucking, carry out test run
does not function or buckled
Valve in pressure pipeline open valve
closed
Unit ventilation blocked Remove ventilation pipe and clean or replace
activated carbon filter
Pump does not Impeller damaged or Clean impeller or replace
function properly dirty
Pipeline blocked Remove blockage
Lift or loss of pressure too Use pipeline with a larger diameter
high,
incorrect dimensioning
Pump runs in short Ventilation blocked Clean ventilation
intervals Leak in flap trap Clean or replace
Motor makes loud Foreign body in the unit Dismantle pump and clean or contact customer
noises when rotating services
If the fault cannot be remedied, please contact your plumbing and heating specialist or your
nearest WILO customer services or representative.
Subject to technical alterations!
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