4 50-18-002-0817
8 Problems, Causes and Solutions
Problems Causes Solutions
The motor does not run Consult motor manufacturer’s
documentation for trouble shooting tips.
No or insufcient capacity a. Voltage too low
b. Suction lter blocked
c. Incorrect motor direction of rotation
d. Low-water protection or water level in well
too low
a. Check electrical power supply at
switchgear.
b. Lift pump out of bore-hole, clean suction.
c. Swap any two phases in the switchgear.
d. Check water level in bore-hole/well; it
must be at least 8” (20” if 8’’ motor) above
the pump pressure pipe connection (during
operation).
Pump switches on too frequently a. Insufcient switching difference between
on/off pressure in pressure switch/gauge
b. Storage volume of diaphragm pressure
vessel too small or pre-pressure setting too
low
a. Increase difference between on and off
points
b.
• Check switching pressure settings and reset
• Check vessel pre-pressure (no water in
vessel)
• Provide additional pressure vessel or install
tank with greater nominal volume.
If the fault cannot be remedied, please contact a Wilo authorized pump installer.
Subject to technical alterations!
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