Xylem LOWARA e-SV Series - Troubleshooting; Precautions; The unit does not start; The differential protection device (RCD) is activated

en – Translation of the Original Instructions
36 e-SV series – Additional Installation, Operation and Maintenance Instructions
7 Troubleshooting
7.1 Precautions
WARNING:
Maintenance must be done by a technician possessing the technical
-
professional requirements
outlined in the current regulations.
WARNING:
Observe the safety instructions given in
Use and operation and Maintenance.
WARNING:
If a fault cannot be corrected or is not mentioned, contact Xylem or the Authorised Distributor.
7.2 The unit does not start
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 on the control panel or
the unit
The device that detects the absence of liquid or minimum
pressure has been triggered
Top up the liquid or restore minimum pressure
The capacitor, if present, is faulty
Replace the capacitor
Control panel faulty
Check and repair or replace the control panel
Motor (coil) faulty
Check and repair or replace the motor
7.3 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
7.4 The thermal overload protection triggers or the fuses trip
The motor thermal overload protection triggers or the fuses trip when the unit starts.
Cause
Remedy
It is calibrated at a value too low in relation to the rated
current of the motor
Recalibrate
Missing power supply phase
Check the power supply and restore the phase
Loose and/or faulty connections of the thermal overload protection
Tighten or replace the clamps and terminals
Loose and/or incorrect and/or faulty (star-delta) connections
in the terminal board of the motor
Tighten or replace the clamps and terminals
Motor (coil) faulty
Check and repair or replace the motor
Pump unit mechanically seized
Check and repair the pump unit
Check valve faulty
Replace the check valve
Foot check valve faulty
Replace the foot check valve