Wilo COE-2 MHIL, Installation And Operating Instructions Manual

Page: 28 / 100

English
28 WILO SE 02/2020
1 pump is not turning Thermal relay activated The “Fault” indicator light for the pumps must be
illuminated on the switchgear. Check the current
setting.
Magnetic circuit breaking
activated Reset.
If the activations persist, check the current absorbed
by the motor in question. If this current is a lot higher
than that indicated on the motor, this is defective and
shall have to be changed.
Pump shaft blocked Switch off the power supply for the switchgear,
then check that the shaft is turning freely. If this
is blocked, dismantle the pump.
Winding malfunction Disconnect the terminal for the motor in question
and check the power supply at the terminals and the
stator’s insulation. Replace the motor if necessary.
Contactor coil burnt Change it.
No pressure on the discharge side Selected flow rate higher than
the capacity of the pressure-
boosting system Consider replacing the pressure-boosting system
for another one that is more suitable (contact us in
any case).
1 or 2 pumps deactivated Check that the suction strainer on the reservoir
does not absorb air and that the filling of the
reservoir is not too close to the strainer.
Municipal water supply pressure
below minimum prescribed
pressure Contact the local water supplier or replace the
pressure-boosting system. Contact us.
The pumps are turning in the
wrong direction Cross-wire 2 power supply wires to the motor
terminals.
1 pump is obstructed by
foreign bodies Dismantle and clean the pump.
The motors are supplied by
insufficient voltage Check the voltage at the motor terminals.
Faults Causes Remedies