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ENGLISH
– Check capacitor size in the case
of 1-phase pumps (observe name
plate data!)
– Rotor shaft has jammed e.g. by
incrustations from the heating
water.
Remedy: Remove central vent
plug, check free movement of
shaft or free respectively at the
slotted shaft end by means of a
screwdriver.
At high water tempera-
tures and system pres-
sures, close isolating val-
ves at both pump ports.
First, allow pump to cool
down.
– On overload release check relay
setting.
8.2 Noise
– Cavitation due to insufficient inlet
pressure
Remedial actions:
– Increase system pressure within
permissible limits.
– Check speed setting, if need
be, adjust to a lower speed set-
ting
If the fault cannot be located or
rectified, please contact your
nearest WILO representative.
9 Spare parts
Available spare parts:
– Pump housing, complete,
– Exchange pump head, complete,
– Terminal box, complete,
– Housing gasket,
– Flap valve, complete (DOP/DOS
only)
State all name plate data when or-
dering spare parts.
Technical modifications reserved.
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