Wilo Multivert MVISE 200, Installation And Operating Instructions Manual

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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 Cause Remedy
The pump is not running
No power supply Check fuse protection, wiring and
connections
Motor protection has interrupted the
power supply Avoid overloading the motor
The pump runs but does not reach its
duty point
Incorrect direction of rotation Check the direction of rotation and correct
as necessary
Pump components are blocked by foreign
objects Check the pump and clean it
Air inclusion in the pump Seal the suction port
Suction line too narrow Install a larger suction line
The stop valve is not sufficiently open Fully open the stop valve
The pump does not pump evenly
Air in the pump 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
The pump vibrates or is loud
Foreign object in the pump Remove the foreign object
The pump is not properly attached to the
ground Tighten the anchor screws
Bearing damaged Contact Wilo customer service
The motor has overheated, motor
protection has been activated
One phase is interrupted Check fuse protection, wiring and
connections
Fluid temperature too high Maximum fluid temperature
Foreign object in the pump Remove the foreign object
Bearing damaged Contact Wilo customer service
The delivery rate is inconsistent In “Constant pressure” or “Variable pres-
sure” mode, the pressure sensor is not
adapted Install a sensor with a compliant pressure
scale and precision
In “Constant pressure” or “Variable
pressure” mode, the pump does not
switch off when the delivery rate is
zero
The non-return valve is not impermeable Clean or change it
The non-return valve is not adapted Replace it with an adapted non-return
valve
The tank does not have enough capacity
for the installation Change it or add another to the installation
If the fault cannot be resolved, please
contact Wilo customer service .
English
WILO SE 04/2020