Xylem Lowara GHV - Troubleshooting

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10. Troubleshooting
Maintenance and repair operations must be carried out by qualified personnel. Before
servicing the set, disconnect the power supply and make sure there is no pressure in the
hydraulic components.
The frequency converter memorizes the last alarms triggered. Refer to the frequency converter operating
instructions for the types of malfunctions and directions on how to view the last alarms triggered.
Problem
Cause
Solution
1. Set is off
1. Power supply disconnected
Connect power supply
2. Switch in OFF position
Set switch to ON
2. Motor does not start
1. Power supply disconnected
Connect power supply
2. Triggering of motor thermal
protector
Eliminate malfunction
3. Defective motor
Repair/replace motor
3. Frequent startups
and stops
1. Defective tank
Repair/replace tank
4. The motor runs but
no water is
delivered
1. No water on suction side or inside
pump
Fill the pump or suction piping /
open the on-off valves
2. Air in suction piping or pump
Bleed the pump, check the
suction connections.
3. Loss of pressure on suction side
Check the NPSH and, if
necessary, modify the system
4. Check valve jammed
Clean the valve
5. Clogged pipe
Clean the pipe
5. Pump leaks water
1. Defective mechanical seal
Replace the mechanical seal
2. Undue mechanical stress on
pump
Support the pipes
6. Too noisy
1. Water return when pumps stop
Check the check valve
2. Cavitation
Check suction
3. Pump rotation hindered
Check for undue mechanical
stress on pump