Wilo Helix EXCEL 10, Installation And Operating Instructions Manual

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51 WILO SE 03/2013
English
10. Faults, causes and remedies
WARNING! 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.
If the fault cannot be solved, please
contact Wilo customer services.
Defaults Possible causes Remedies
Pump fails to operate No current Check the fuses, the wiring, and the con-
nectors
Thermistor tripping device has tripped
out, cutting off power Eliminate any cause of overloading of the
motor
Pumps 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 obstructed 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
In « Constant pressure » mode, the
pressure sensor is not adequate Put a sensor with conforming pressure
scale and accuracy
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 Wilo Customer Service
Motor overheats, its protection trips out A phase is open-circuit Check the fuses, the wiring, and the con-
nectors
Ambient temperature too high Provide cooling
Mechanical seal is leaking Mechanical seal is damaged Replace the mechanical seal
In « Constant pressure » mode, the pump
does not stop if the flow is zero The non-return valve is not tight Clean it or change it
The non-return valve is not adequate Replace it by an adequate non-return
valve
The tank has low capacity due to the
installation Change it or add an other one on the
installation