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10. Faults, causes and remedies
WARNING! Danger due to electrical voltage!
Dangers from electricity must be ruled out.
The pump must be voltage-free before com-
mencing electrical work and secured against
unintended reactivation.
WARNING! Risk of burns!
If the water temperature and the system pres-
sure are high, close the stop valve on the suction
side and on the pressure side.
The pump must cool down
Fault
The pump is not running
The pump runs but does not reach its
duty point
The pump does not pump evenly
The pump vibrates or is loud
The motor has overheated, motor
protection has been activated
The delivery rate is inconsistent
In "Constant pressure" or "Variable
pressure" mode, the pump does not
switch off when the delivery rate is
zero
If the fault cannot be resolved, please
contact Wilo customer
62
first.
Cause
No power supply
Motor protection has interrupted the
power supply
Incorrect direction of rotation
Pump components are blocked by foreign
objects
Air inclusion in the pump
Suction line too narrow
The stop valve is not sufficiently open
Air in the pump
Foreign object in the pump
The pump is not properly attached to the
ground
Bearing damaged
One phase is interrupted
Fluid temperature too high
Foreign object in the pump
Bearing damaged
In "Constant pressure" or "Variable pres-
sure" mode, the pressure sensor is not
adapted
The non-return valve is not impermeable
The non-return valve is not adapted
The tank does not have enough capacity
for the installation
service.
Remedy
Check fuse protection, wiring and
connections
Avoid overloading the motor
Check the direction of rotation and correct
as necessary
Check the pump and clean it
Seal the suction port
Install a larger suction line
Fully open the stop valve
Vent the pump and ensure that the
suction line is sealed.
If necessary, start the pump for 20
to 30 s. Open the venting screw so that
the air can escape. Close the venting
screw and repeat the procedure as often
as required
Remove the foreign object
Tighten the anchor screws
Contact Wilo customer service
Check fuse protection, wiring and
connections
Maximum fluid temperature
Remove the foreign object
Contact Wilo customer service
Install a sensor with a compliant pressure
scale and precision
Clean or change it
Replace it with an adapted non-return
valve
Change it or add another to the installation
WILO SE 04/2020
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