en – Original instructions
25
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.
The frequency converter saves the last alarms that have occurred. Refer to the instructions on
use of the frequency converter for the types of fault and how to check the last alarms that have
occurred.
7.1 The booster set is off
7.2 Motor does not start
The thermal overload protection of
the motor has been triggered
Eliminate the fault and reset the switch
Check and repair or replace the motor
7.3 Frequent start-ups and stops
Diaphragm pressure tank faulty
Repair or replace the diaphragm pressure tank
Incorrect pre-charge of the
diaphragm pressure tank
Set the new pressure pre-charge value according to the pump unit and
setpoint
The pre-charge value of the
diaphragm pressure tank is at zero
The diaphragm pressure tank must be pre-charged
7.4 The speed of the pump unit increases and decreases without
stopping and without consumption of water (utility closed)
Loss of water from the non-return
valve
Check the hydraulic system and the valve
The diaphragm pressure tank is
damaged or undersized
Repair or replace the diaphragm pressure tank
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General