Wilo Helix VE 11kW-IE5, Installation And Operating Instructions Manual

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37 Installation and operating instructions – Wilo-Helix VE / MVIE 11/15/18,5/22kW – IE5
English
10. Faults, causes and remedies
WARNING! Risk of electric shock!
Danger from electrical current must be eliminated.
Ensure that the pump’s power supply is switched
off and secured against unauthorised reactiva-
tion before performing any work on the electric
system .
WARNING! Risk of burns!
In case of high water temperatures and high sys-
tem pressures, close the guard valves upstream
and downstream of the pump. First, allow pump
to cool down .
Faults Causes Remedies
The pump is not functioning No electrical power supply Check the fusible cut-outs, the wiring and
the connections
The motor protection device has cut off
the power
Eliminate any motor overload
The pump is functioning but is failing
to reach its duty point
Incorrect direction of rotation Check the direction of rotation and correct
it if necessary
Parts of the pump are obstructed by
foreign bodies
Check and clean the pump
Air in the suction pipe socket Make the suction pipe socket air-tight
Suction pipe socket too narrow Install a wider suction pipe socket
The valve is not open far enough Open the valve completely
The output of the pump is irregular Presence of air in the pump Remove the air from the pump and ensure
that the suction pipe socket is sealed.
Possibly start the pump for 20 – 30 s.
Open the drain cock to let air escape.
Close the drain cock and repeat several
times until no more air comes out of the
drain cock
In “Constant pressure” mode, the pressure
sensor is not adapted
Install a sensor with a compliant pressure
scale and precision
The pump is vibrating or is noisy Foreign matter in the pump Remove the foreign matter
The pump is not firmly secured to the
ground
Tighten the anchor screws
Bearing damaged Contact Wilo customer service
The motor is overheating, the motor
protection engages
A phase is interrupted Check the fusible cut-outs, the wiring and
the connections
Ambient temperature too high Provide cooling
The mechanical seal is leaking The mechanical seal is faulty Replace the mechanical seal
The delivery rate is inconsistent In “Constant pressure” or “Variable
pressure” mode, the pressure sensor is
not adapted
Install a sensor with a compliant pressure
scale and precision
In “Constant pressure” or “Variable
pressure” mode, the pump does not
switch off when the delivery rate is
zero
The non-return valve is not impermeable Clean or change it
The non-return valve is not adapted
Replace it with an adapted non-return
valve
The tank does not have enough capacity
for the installation
Change it or add another to the installation
If the fault cannot be resolved, please
contact Wilo customer service .