Install Instructions

ENGLISH
11
Problem Causes Remedy
Pump is connected Motor is blocked, e.g. Check and if necessary rectify that the rotor
but fails to run. by deposits from the shaft still rotates freely.
The green indicator system fluid.
light is on.
(Fig.5/6, Pos.2)
Pump with equipped vent plug:
x
Remove the vent plug,
x
insert a flat head screwdriver into the slot end
of the shaft and turn to ensure free rotation,
x
replace the vent plug.
Pump without equipped vent plug:
x
Disassemble the motor head and check;
unblock by turning the impeller if necessary.
If the blockage cannot be removed,
contact Customer Services.
Pump output too There is foreign Disassemble the pump head and remove
low. material inside foreign material.
The green indicator the pump housing
light is on. or impeller.
(Fig.5/6, Pos.2)
Wrong pumping Exchange the pump suction and discharge sides.
direction. Observe the arrow indicating direction on the
pump housing.
Shut-off valves are Open the shut-off valves fully.
not fully open.
Three-phase pumps Correct the electrical connection in the
only: terminal box:
Wrong direction of
x
Interchange two phases on the mains terminal.
rotation.
The red LED is on.
(Fig.5, Pos.3)
Noise in the system. Air in the system. Vent the system.
The green indicator
The pump flow is too Decrease the pump output by switching to a
light is on.
high. lower speed.
(Fig.5/6, Pos.2)
The pump head is too Check speed setting, if necessary switch to a
high. lower speed.
Noise in the pump. Air in the pump. Vent the pump / unit (see chapter 8.1)
The green indicator
Cavitations due to Increase system pressure within the permissible
light is on.
insufficient inlet range.
(Fig.5/6, Pos.2)
pressure.
There is foreign Disassemble the pump head and remove the
material inside the foreign material.
pump housing or
impeller.
Shut-off valves are Open the shut-off valves fully.
not fully open.
If the fault cannot be remedied, please contact your local heating specialist or WILO custo-
mer services.
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