EN
E-MXAM E-MXPM E-NGXM Rev6 - Operating Instructions
Page 17 / 96
13. TROUBLESHOOTING
OFF
WARNING
: Turn off the power supply before performing any operations.
Do not allow the pump or motor to run when dry even for a short period.
Strictly follow the user instructions and if necessary contact an authorised service centre.
PROBLEM
PROBABLE CAUSES
POSSIBLE REMEDIES
1)
The motor does
not start
a) Unsuitable power supply
b) Shaft blocked
c)
If the above causes have already
been checked, the engine may be
malfunctioning
a) Check that the mains frequency and voltage correspond to the electrical
characteristics shown on the indicator plate
b) Remove the cause of blockage as indicated in the “Blocked pump”
instruction booklet
c) Repair or replace the engine by applying to an authorised service centre
2)
Pump blocked
a)
Prolonged periods of inactivity with
formation of rust inside the pump
b) Presence of solid bodies in the pump
rotor
c) Bearings siezed
a) Unblock the pump by using a screw driver to turn the relevant notch on
the back of the shaft (remember to turn off the electricity supply first ) or
contact an authorised service centre
b) If possible, dismantle the pump casing and remove any solid foreign
bodies inside the rotor, if necessary contact an authorised service
centre
c) If the bearings are damaged replace them or if necessary contact an
authorised service centre
3)
The pump
functions
but no water
comes out
a) Possible infiltration of air from suction
tube connections, drain plugs or filling
of pump or from the gaskets of the
suction pipe
b) Foot valve blocked or suction pipe not
fully immersed in liquid
c) Suction filter blocked
d) Non-return valve blocked
a) Check which part is not tight and seal the connection adequately
b) Clean or replace the bottom valve and use a suction pipe suitable for
the application
c) Clean the filter, if necessary, replace it . See point 2a) also.
d) Verify that the integrated non-return valve is working properly.
4)
The pump does
not stop
a) Non-return valve broken, blocked or
clogged with solid parts.
b) Stop pressure (parameter UP01) too
high.
c) Insufficient pump performance
a) Check the function of the integrated check valve and remove the solid
parts present in the valve.
b) Check the value of parameter UP01 and if necessary reduce it.
c) Contact an authorised service center.
5)
The pump works
intermittently
a) Non-return valve broken, blocked or clogged
with solid parts
b) Incorrect tank pressure, Empty tank or
broken membrane.
a) Check if the built-in check valve is working properly and remove the
solid parts present in the valve
b) Check the tank pressure
6)
Insufficient flow
a) Pipes and accessories with diameter too
small causing excessive loss of head
b) Presence of deposits or solid bodies in
the internal passages of the rotor
c) Rotor deteriorated
d) Excessive viscosity of the liquid pumped
(if other than water)
e) Suction head excessive in relation to the
suction capacity of pump
f) Suction pipe too long
a) Use pipes and accessories suitable for the specific application
b) Clean the rotor and install a suction filter to prevent other foreign bodies
from entering
c) Replace the rotor, if necessary, contact an authorised service centre
d) The pump is unsuitable
e) Try to close the feeder gate partially and/or reduce the difference in level
of the pump and the liquid being aspirated
f) Bring the pump closer to the suction tank so as to use a shorter pipe. If
necessary use a pipe of a wider diameter
7)
Noise and
vibrations
from the pump
a) Rotating part unbalanced
b) Worn bearings
c) Pump and pipes not firmly attached
d) Flow too strong for the diameter of the
delivery pipe
e) Functioning in cavitation
a) Check that no solid bodies are obstructing the rotor
b) Replace the bearings
c) Anchor the delivery and suction piping as needed
d) Use bigger diameters or reduce the pump flow
e) Reduce the flow by adjusting the feeder gate and/or using pipes with a
bigger internal diameter. See point 6f) too
8)
Leakage from
the mechanical
seal
a) The mechanical seal has functioned
when dry or has stuck
b) Mechanical seal scored by presence of
abrasive parts in the liquid pumped
c) Mechanical seal unsuitable for the type
of application
d) Slight initial drip during filling or on first
start-up
In cases a), b) and c), replace the seal, if necessary contact an authorised
service centre
a) Make sure that the pump casing (and the suction pipe if the pump is
not self-priming) are full of liquid and that all the air has been expelled.
See point 6d) too.
b) Install a suction filter and use a seal suited to the characteristics of the
liquid being pumped.
c) Choose a seal with characteristics suitable for the specific application
d) Wait for the seal to adjust to the rotation of the shaft. If the problem persists,
see points 8a), 8b) or 8c) or contact an authorised service centre.
9)
Excessive
number of
starts/hour
a) Pump carried out 15 starts in a short
time with cycle time lower than AP03
parameter (
)
b) Pump started more than 240 times in 2
hours (Er05)
a) Check the tank pressure and if necessary install a higher capacity tank
b) Check the tank pressure and if necessary install a higher capacity tank
Changes reserved.
E-MXAM E-MXPM E-NGXM Rev6.indd 17
E-MXAM E-MXPM E-NGXM Rev6.indd 17
02/02/22 14:35
02/02/22 14:35
