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8. Fault Findings –
Causes and Remedies
8.1 Pump is switched on, but
fails to run:
– Check power supply fuses.
– Check voltage at pump terminals
(refer to name plate data).
– Check capacitor size (refer to name
plate data!).
– Rotor shaft has jammed, e.g. by
incrustations.
Remedy: Remove central access
plug, check free movement of shaft
or free respectively at the slotted
shaft end by means of a screw-
driver.
Observe safety procedures
as for 6.1!
At high water temperatures
and system pressures, close
isolating valves at both pump
ports. First, allow pump to
cool down.
8.2 Noise
– Cavitation due to insufficient inlet
pressure.
Remedy: Increase system pressure
within permissible limits.
If the fault cannot be located or rec-
tified, please contact your nearest
Wilo representative.
9. Spare Parts
State all name plate data when order-
ing spare parts.
Technical modifications reserved.
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