10
WILO SE 02/2016
English
11. Spare parts
All spare parts must be ordered through WILO
Customer Services.
In order to avoid any mistakes, please specify the
name plate data for orders.
Spare parts catalogue is available at
www.wilo.com.
Subject to technical alterations!
Faults
Causes
Remedies
No delivery pressure
Flow higher than booster capabilities
Plan to replace the booster by a more
adequate one (do not forget to contact
us in any case)
One or two pumps not primed
Check that the suction strainer does not
let air in or the tank filling point is too
close from the strainer
Public water pressure lower than the
minimum pressure planned
Contact the public water supply compa-
ny or replace the booster.
Contact us
Pumps turn in the reserve direction
Cross 2 supply wires at the motor termi-
nal blocks
A pump is obstructed by particles
Have the pump dismantled and cleaned
Voltage of the motors too low
Check the voltage on motor terminals
Contactor tripping too frequent, starting
frequency too high
Required pressure wrong set
Reset it
Installation capacity too low
Add a tank
No air inside the tank
Pressurize the tank or replace the bladder
Tripping frequency of dry running safety
too high
Setting of dry running pressure switch-
too high
Set the pressure switch correctly
Drop of the public water supply pressure
when starting the pumps
Set the dry running pressure switch to
the minimum value. If it recurs, the public
water mains is inadequate, check the
pressure with the pressure gauge when
starting the pumps or contact the public
water mains service
Operating automatism device defective
Wires disconnected
Check all connections to the terminal
block of the control box
Transmitter defective
Install the bypass on the transmitter base
Discharge check valve not tight
Valve diaphragm destroyed
Change the valves
