4LPPT70EN - 5/2023
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6.5 Troubleshooting
Table 6.
Troubleshooting.
PROBLEM
POSSIBLE REASON
ACTION
The pump won’t start.
The power is not on.
The supply cable is not connected or is connected
incorrectly.
There is a power supply problem.
Safety locking is on.
Turn the power on.
Connect the supply cable (authorised electrician only).
Check the power supply (authorised electrician only).
Acknowledge the safety equipment.
The pump does not produce
volume flow.
The suction valve is closed.
The suction line is blocked.
Open the suction valve.
Check the suction piping.
The pump does not produce full
volume flow.
The viscosity or specific weight of the pumped
medium is too high.
The suction line is partly blocked.
The hose compression is incorrect, resulting in
backflow.
The suction height is too high.
Check the measurement parametres of the pump and the
properties of the medium.
Clean the suction piping.
Adjust the hose compression.
Check the suction piping.
The hose life is short.
The hose compression is too high.
Too little LPP-T lubricant has been used.
There are loose particles in the medium that damage
the hose.
Readjust the compression.
Check the amount of lubricant.
Prevent large particles from entering the pump.
Pump output drops in
mid-operation.
The hose compression is incorrect, resulting in
backflow.
The suction piping is partly blocked.
Readjust the hose compression.
Clean the suction piping.
The pump won’t restart.
The pressure in the piping is too high.
There is a blockage in the piping.
There is a blockage in the pump hose.
Identify the cause of excessive pressure in the piping.
Clean the piping.
Clean or change the hose.
Acknowledge the safety equipment.
There is medium in the pump
housing.
The hose is leaking.
Clean the pump housing and change the hose.
The pump starts but stops shortly
afterwards.
The supply cables have been connected incorrectly
(star/delta connection).
Check the power supply (authorised electrician only).