English
42
WILO SE 11/2013
10 Faults, causes and remedies
Have faults remedied by qualified personnel only! Observe the safety
instructions in chapter 9!
Fault
Cause
Remedy
The system is noisy.
Air in the system.
Vent the system.
The flow rate at the pump
is too high.
Reduce the pump power by
switching to a lower speed.
The pump delivery head is
too high.
Reduce the pump power by
switching to a lower speed.
Pump is making
noises.
Cavitation due to insuffi-
cient supply pressure.
Check pressure stability / supply
pressure and if necessary increase
them within the permissible range.
Foreign bodies in the
pump housing or impeller.
After dismantling the motor impel-
ler unit, remove the foreign body.
Air within the pump.
Vent the pump/system.
The check valves in the
system are not fully open.
Fully open the check valves.
The pump power is too
low.
Foreign bodies in the
pump housing or impeller.
After dismantling the motor impel-
ler unit, remove the foreign body.
Incorrect flow direction.
Interchange the pressure side and
suction side of the pump. Refer to
the direction symbol on the pump
housing or pump flange.
The check valves in the
system are not fully open.
Fully open the check valves.
Incorrect direction of
rotation.
Correct the electrical connections
in the terminal box:
Refer to the direction of rotation
arrow on the rating plate
(only for 3~) terminal box type 6/7:
Indicator light off
Interchange two phases at the
mains supply terminals.
Summary of Contents for TOP-I
Page 2: ...Fig 1 Fig 2 Fig 3 ...
