Problems, Causes And Remedies - Wilo TOP-S Notice De Montage Et De Mise En Service

8 Problems, Causes and Remedies

Problem
The unit is making
noises
The pump is making
noises
Pump output
too low
Cause
There is air in the unit.
The pump volume rate is too strong.
The pump lift is too high.
Cavitation noise has occured in the
pump due to insufficient inlet pressure. admission pressure and increase to
There is a foreign body inside the
pump housing or impeller.
There is air in the pump.
Shut-off valves are not fully open.
There is a foreign body inside the
pump housing or impeller.
Wrong pumping direction.
Shut-off valves are not fully open.
Wrong direction of rotation
(for only 3~) Terminal box types 4/5:
LED off
(for only 1~) Terminal box types 6/7:
LED off
(for only 3~) Terminal box types 6/7:
LED off
ENGLISH
Remedy
Vent the unit.
Decrease the pump output by switch-
ing to a lower speed.
Decrease the pump output by switch-
ing to a lower speed.
Check the pressure level/system
the admissible range.
Disassemble the pump head and
remove the foreign body.
Vent the pump/unit.
Open the shut-off valves fully.
Disassemble the pump head and
remove the foreign body.
Exchange the pump pressure and
suction sides. Observe the arrow indi-
cating direction on the pump housing.
Open the shut-off valves fully.
Correct the electrical connection in
the terminal box:
Interchange two phases on the mains
terminal
Correct capacitor connection
Interchange two phases on the mains
terminal
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