Lowara e-HM series, Installation, Operation And Maintenance Manual, Page: 32 / 44

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 requirements in the chapters on 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
Power supply cable is damaged Replace the power supply cable
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 motor thermal overload protection or the fuses trigger
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
7 Troubleshooting
30 e-HM Series Installation, Operation and Maintenance Manual