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en – Original instructions
7.6 The pump unit starts, but the
system's general protection is
activated
Cause
A short circuit in the
electrical system.
7.7 The pump unit starts, but the
system's residual current device
(RCD) is activated
Cause
Solution
There is an ground
Check the insulation of the
(earth) leakage.
electrical system components.
7.8 The pump runs but delivers too
little or no liquid
Cause
Solution
There is air
Bleed the system.
inside the pump
or the piping.
The pump is not
Stop the pump and repeat the
correctly
prime procedure.
primed.
If the problem continues:
•
•
The throttling on
Open the valve.
the delivery side
is too extensive.
The rotation
Change the position of two of
direction of the
the phases on the terminal
impeller is
board of the motor or in the
wrong .
electric control panel.
7.9 The pump unit stops, and then
rotates in the wrong direction
Cause
There is a leakage in one or
both of the following
components:
•
The suction pipe
•
The foot valve or the
check valve
26
Solution
Check the electrical
system.
Check the suction pipe
for perfect tightness.
Replace any valves that
are leaking.
Solution
Repair or replace
the faulty
component.
7.10 The pump starts up too
frequently
Cause
There is a leakage in one
or both of the following
components:
•
The suction pipe
•
The foot valve or
the check valve
There is a ruptured
membrane or no air pre-
charge in the pressure
tank.
7.11 The pump vibrates and
generates too much noise
Cause
Solution
Pump
Reduce the required flow rate by
cavitation.
partially closing the on-off valve
downstream from the pump. If the
problem persists check the
operating conditions of the pump
(for example height difference, flow
resistance, liquid temperature).
There are
Contact Xylem or the Authorised
foreign
Distributor.
objects
inside the
pump.
Contact Xylem or the Authorised Distributor with
regard to any situation not covered here.
Solution
Repair or replace the
faulty component.
See the relevant
instructions in the
pressure tank
manual.
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