Faults, Causes And Remedies - Wilo Multivert MVIS Notice De Montage Et De Mise En Service

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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 first.
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
If the fault cannot be remedied,
contact Wilo customer service.
20
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
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
WILO SE 01/2020