Xylem GHV - Manual (Page 16)

11.Disposal
Proceed in compliance with local codes and regulations pertaining to disposal of waste, including packa-
ging materials.
16
en
Problem
1. Set is off
2. Motor does not start
3. Frequent startups
and stops
4. The motor runs but
no water is delivered
5. Pump leaks water
6. Too noisy
Cause
1. Power supply disconnected
2. Switch in OFF position
1. Power supply disconnected
2. Triggering of motor thermal pro-
tector
3. Defective motor
1. Defective tank
1. No water on suction side or inside
pump
2. Air in suction piping or pump
3. Loss of pressure on suction side
4. Check valve jammed
5. Clogged pipe
1. Defective mechanical seal
2. Undue mechanical stress on pump
1. Water return when pumps stop
2. Cavitation
3. Pump rotation hindered
Solution
Connect power supply
Set switch to ON
Connect power supply
Eliminate malfunction.
Repair/replace motor
Repair/replace tank
Fill the pump or suction piping / open
the on-off valves
Bleed the pump, check the suction
connections.
Check the NPSH and, if necessary,
modify the system
Clean the valve
Clean the pipe
Replace the mechanical seal
Support the pipes
Check the check valve
Check suction
Check for undue mechanical stress
on pump