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10. Faults, causes and remedies
WARNING! Electrical shock hazard!
All electrical work must be performed after the
electrical supply has been switched off and se-
cured against unauthorized switching.
WARNING! Risk of scalding!
Pressurized water can easily turn into steam when
venting, creating a condition where scalding may
occur.
Defaults
Pump fails to operate
Pumps runs but delivers too little
Pump delivers unevenly
Pump vibrates or is noisy
Motor overheats, its protection trips out
Mechanical seal is leaking
Irregular flow
In « Constant pressure » mode, the pump
does not stop if the flow is zero
If the fault cannot be solved, please
contact Wilo customer service.
WILO SE 05/2014
Possible causes
No current
Thermistor tripping device has tripped
out, cutting off power
Wrong direction of rotation
Parts of the pump are obstructed by for-
eign bodies
Air in suction pipe
Suction pipe too narrow
The valve is not open far enough
Air in pump
In « Constant pressure » mode, the pres-
sure is incorrect
Foreign bodies in pump
Pump not properly attached to ground
Bearing damaged
A phase is open-circuit
Ambient temperature too high
Mechanical seal is damaged
In « Constant pressure » mode, the
pressure sensor is incorrectly set
The non-return valve is not tight
The non-return valve is not adequate
The tank has low capacity due to the in-
stallation
Remedies
Check the fuses, the wiring, and the
connectors
Eliminate any cause of overloading of the
motor
Check the direction of rotation of the
motor and correct it if necessary
Check and clean the pipe
Make the suction pipe airtight
Install a larger suction pipe
Open the valve properly
Evacuate the air in the pump; check that
the suction pipe is airtight. If required,
start the pump 20-30s – open the air
bleed screw in order to move air away –
close the air bleed screw and repeat it se-
veral times until no more air is going out
of the pump
Put a sensor with conforming pressure
scale and accuracy
Remove the foreign bodies
Retighten the screws
Call Wilo Customer Service
Check the fuses, the wiring, and the
connectors
Provide cooling
Replace the mechanical seal
Ensure the pressure sensor and scale of
pressure conform
Clean it or change it
Replace it by an adequate non-return
valve
Change it or add an other one on the in-
stallation
English
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