7
The list below shows some possible malfunctions of the device, possible causes and tips on their elimination. All
the measures referred to may only be carried out with the pump being separated from the electrical mains. If you
yourself feel unable to eliminate any of these malfunctions, please contact the customer service department or
your point of sales. Any repair beyond the scope specified below must only be performed by qualified staff.
Please bear in mind that all warranty claims will become void in the case of damage caused by inappropriate
repair attempts, and that we decline any liability for any ensuing damage.
MALFUNCTION
POSSIBLE CAUSE
ELIMINATION
1. The pump is not discharging
any liquid, the motor is not
running.
1. No current.
2. Thermal motor protection feature has
triggered.
3. The capacitor is defective.
4. The motor shaft is jamming.
5. Inlet pressure is too low and generally
accompanied by cavitation noise.
6. Insufficient voltage.
1. Please use a device complying with GS
(German technical supervisory authority)
to check for the presence of voltage
(safety information to be observed!).
Please verify the correct position of the
plug.
2. Separate the pump from the electrical
mains, allow the system to cool down,
eliminate cause.
3. Please contact the customer service
department.
4. Check the cause; eliminate the reason for
the jamming of the pump.
5. Excessive loss of head in suction or the
suction height is excessive (check the
NPSH of the installed pump).
6. Check the voltage of the motor terminals.
The voltage should be ± 10% of the rated
voltage.
2. The motor is running, but the
pump is not discharging any
liquid.
1. The pump housing is not filled wit h liquid.
2. Air penetrates into the intake line.
3. Suction height and/or discharge height too
great.
1. Fill the pump housing with liquid (please
refer to ”Putting into operation” section).
2. Check to make sure that:
a.) the connection points of the intake line
are tight;
b.) the inlet opening of the intake line
including the check valve (non-return
valve) are immersed into the liquids
being discharged;
c.) the check valve (non-return valve) with
the filter is tight and not jammed;
d.) no siphons (i.e. permanently liq uid-
filled loops), kinks, counter -slopes or
narrow spots are present along the
intake lines.
3. Change the arrangement of the installation
so that the suction height and/or discharge
height will not exceed the max. value.
3. The pump stops after a short
time of operation because the
thermal motor protection
feature has triggered.
1. The electrical supply does not correspond
to the information given on the type plate.
2. Pump or intake line is blocked by solids.
3. Liquid is too viscous.
4. Temperature of liquid or envir onment is
too high.
1. Please use a device complying with GS
(German technical supervisory authority)
to check the voltage of the lines of the
connection cord (safety information to be
observed!).
2. Remove possible congestion.
3. Pump may not be suitable for this liquid. If
feasible, the liquid should be thinned.
4. Make sure that the temperature of the
liquid being pumped and the environment
do not exceed the max. admissible values.
4. The pump does not reach the
desired pressure.
1. Refer to section 2.2.
2. Worn pump wheel .
1. Refer to section 2.2.
2. Please contact the customer service
department.
5. The pump vibrates.
1. Anchorage on a faulty base.
2. Foreign bodies obstructing the pump.
3. Obstruction to the pump rotation.
1. Check and fully tighten the nuts on the
bolts of the studs.
2. Dismantle the pump and clean it.
3. Check that the pump can rotate freely
without any abnormal resistance.
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MSX_85-55 INOX_135-60 INOX_30098_30099_IM_180427.pdf 18 27.04.2018 09:06:11
