Troubleshooting - Lowara GEMK Serie Instrucciones Para La Instalación Y El Uso

10. TROUBLESHOOTING

A few troubleshooting operations can be performed directly by the user, while others must be carried out by a qualified
maintenance technician.
Important: before carrying out any of these operations, refer to the relative section on putting the diesel
pump in safe mode.
Fault
1. The control unit does
not switch on
2. The control unit
starts and stops
continually
3. The motor runs but
no water is delivered
4. Pump leaks water
5. Too noisy
6. The pump does not
prime
7. The unit does not
provide the required
level of performance.
Cause
1. Batteries partially charged
2. Handle in OFF position
3. QU3 fuse carrier open or
blown fuse
4. Connections to battery
terminals corroded or loose
1. Panel connected only to the
supply of Vac alternating
voltage and the batteries are
not connected.
2. Defective control unit
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
1. Suction piping of insufficient
width; excessive use of fittings
that cause sudden changes in
direction of the suction piping;
siphon effect
2. Clogged suction piping
3. Air leaking into the suction line
of the pump
4. Base valve clogged or blocked
5. On-off valve on suction line
partially closed
1. Use of a unit of insufficient
size in relation to the nature of
the system.
2. Excessive consumption of
water in relation to the amount
supplied by the water source
(tank, well, aqueduct, etc.)
3. One or more pumps are clogged
4. Clogged pipes.
5. Base valves clogged or
blocked (suction lift
installation)
6. On-off valves on suction and
delivery lines partially closed.
7. Leaking of air in the inlet pipes
of the pumps of the unit.
Solution
Check and recharge the batteries; replace them if necessary.
Set handle to ON
Check the fuse carrier and, if necessary, replace the fuse
Clean, examine and tighten the nuts on the battery terminals.
Replace the cable terminals and nuts if they are too corroded
Connect the starting batteries immediately (otherwise you will
have problems with the control unit).
Replace the control unit
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
Check correct layout and installation of the suction piping with
reference to the section on "Installation.
Clean or replace it.
Carry out a pressure test to check the airtightness of the
fittings, joints and pipes.
Clean or replace it.
Open it fully.
Replace it with one that meets
the requirements.
Increase the amount supplied by the
water source.
Disassemble these and clean the body of the pump and the
impellers,
checking that these are in good condition.
Clean or replace them.
Clean or replace them.
Open these fully.
Carry out a pressure test to check the airtightness of the
fittings, joints and pipes.
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