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20 WILO SE 11/2010
10 Faults, causes and remedies
Faults are only to be fixed by qualified service
technicians!
The safety instructions in chapter 9
(“Maintenance”) must be followed.
Faults Causes Remedy
The pump does not start. No mains voltage. Check fuses, connections and the supply
line.
To acknowledge the fault, press the
control button on the pressure and
flow controller Ecocontrol PAC
(fig. 4, item 9d).
Fuse defective Renew fuse
Motor protection tripped, Correct motor overload
Pump not running smoothly, Eliminate blockages of the pump
Pump blocked Eliminate blockage of the pump
Motor overheating
Motor protection trips
Inadequate voltage Check voltage
Pump not running smoothly:
Foreign bodies in the pump
Rotors blocked,
Bearing damaged
Clean pump
Clean pump
Have the pump repaired by Wilo cus-
tomer service
Ambient temperature too high Improve the cooling and perform a
restart after cooling down.
Geodesic head > 1000 m Pump is only approved for geodesic head
< 1000 m
Motor defective Have the motor replaced by Wilo cus-
tomer service
Pump is running but not pumping
Supply voltage too low Check mains voltage, capacitor and
cables
Suction/pressure line or parts of the
pump are blocked by foreign bodies
Check suction/pressure line and pump,
clean
Air in suction port Seal suction line
Air in the pump Fill the pump again
Inlet pipe or suction line too narrow Install an inlet pipe or suction line with a
larger nominal diameter
Immersion depth of the foot valve too
low
Increase immersion depth of the foot
valve
Pump is not pumping smoothly Suction head too large Check water level in the cistern.
Position the rainwater utilisation system
closer to the ground
The pressure generated by the pump is
not sufficient.
The suction filter/strainer are blocked.
The foot valve is blocked.
The suction line is blocked
The suction head is too large.
Clean:
• Suction filter/strainer
•the foot valve
• the suction line.
Check water level in the cistern.
Position the rainwater utilisation system
closer to the ground
Check valve not opened sufficiently Open the check valve
Foreign matter is blocking the pump Clean pump
Rainwater utilisation system vibrates
Foreign matter in the pump Remove the foreign matter
Pump not running smoothly Check smooth running of the pump/
motor
Attachment surface is not solid enough Shore up attachment surface
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