en
Faults, causes and remedies
22
WILO SE 02/2022
10
Faults, causes and remedies
DANGER
Electrical shock hazard!
Dangers caused by electrical energy must be excluded.
All electrical work must be performed after the electrical supply has been switched
off and secured against unauthorized switching.
WARNING
Risk of scalding!
At high water temperatures and system pressure close isolating valves before and
after the pump. First, allow pump to cool down.
Faults
Cause
Remedies
Pump does not run
No current
Check the fuses, the wiring, and the connectors
The thermistor tripping
device has tripped out, cut-
ting off power
Eliminate any cause of overloading of the motor
Pump runs but delivers too
little
Wrong direction of rotation
Check the direction of rotation of the motor and correct it
if necessary
Parts of the pump are ob-
structed by foreign bodies
Check and clean the pipe
Air in suction pipe
Make the suction pipe airtight
Suction pipe too narrow
Install a larger suction pipe
The valve is not open far
enough
Open the valve properly
Pump delivers unevenly
Air in pump
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 several times until no more air is going
out of the pump
Pump vibrates or is noisy
Foreign bodies in pump
Remove the foreign bodies
Pump not properly attached
to ground
Retighten the screws
Bearing damaged
Call the Wilo Customer Service
Motor overheats, its protec-
tion trips out
A phase is open-circuit
Check the fuses, the wiring, and the connectors
Ambient temperature too
high
Provide cooling
Mechanical seal is leaking
Mechanical seal is damaged
Replace the mechanical seal
If the fault cannot be solved, please contact the Wilo customer services.
11
Spare parts
All spare parts should be ordered directly from the Wilo customer service. To prevent
errors, always quote the data on the pump’s rating plate when making an order. The
spare parts catalogue is available at www.wilo.com
12
Disposal
Information on the collection of used electrical and electronic products.
Proper disposal and appropriate recycling of this product prevents damage to the envi-
ronment and dangers to your personal health.
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