Lowara LNTSH 65-125/05/S45RCS4 [24/438] Troubleshooting

Lowara LNES 125-200/75/P45VCB4 [24/438] Troubleshooting
en - Original instructions
24
7 Troubleshooting
Precautions
WARNING:
Faults must be corrected by a technician
possessing the technical-professional
requirements outlined in the current
regulations
Observe the safety requirements in the
chapters on Use and Operation and
Maintenance
If a fault cannot be corrected or is not
mentioned, contact Xylem or the
Authorised Distributor.
7.1 The pump unit is turned on but does
not work
Cause
Remedy
Power supply cut off
Restore the power supply
The thermal overload
protection of the motor has
been triggered
Reset the thermal
overload protection in the
control panel or the one in
the pump unit
The device that detects
the absence of liquid or
minimum pressure has
been triggered
Top up the liquid or
restore minimum pressure
Power supply cable is
damaged
Replace the power supply
cable
The condenser is faulty, if
present
Replace the condenser
Control panel faulty
Check and repair or
replace the control panel
Motor (coil) faulty
Check and repair or
replace the motor
7.2 The differential protection device
(RCD) is activated
Cause
Remedy
Motor leaking
Check and repair or replace
the motor
Unsuitable type of
differential
Check the type of differential
7.3 The thermal overload protection of
the motor is triggered when the
pump unit starts
Cause
Remedy
It is calibrated at a value too low
in relation to the rated current of
the motor
Recalibrate
Check the power
supply and restore
the phase
Tighten or replace
the clamps and
terminals
Tighten or replace
the clamps and
terminals
Check and repair or
replace the motor
Check and repair
the pump unit
Replace the power
supply cable
Replace the check
valve
Replace the foot
valve
Replace the flap
valve
7.4 The thermal overload protection of
the motor is triggered occasionally,
or after the pump unit has been
running for a few minutes
Cause
Remedy
It is calibrated at a value
too low in relation to the
rated current of the motor
Recalibrate
Input voltage outside the
rated limits
Make sure the voltage
values are correct
Unbalanced input voltage
Make sure the voltage of
the three phases is
balanced
Incorrect working curve
(flow rate greater than the
maximum permitted flow
rate)
Reduce the required flow
rate
Liquid too dense,
presence of solid or
fibrous substances (pump
unit overloaded)
Reduce the density of
the liquid and/or
Remove the solid
substances and/or
Increase the size of the
motor
Room temperature too
high, exposure to sunlight
Lower the temperature
at the point of the
thermal overload
protection and/or
Protect against direct
sunlight
Pump unit faulty
Send the pump unit to an
authorised workshop for
testing

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