14. Troubleshooting
Problem
Possible cause
Recommended Action
Dosing pump not
delivering or output
too low.
Check valves leaking or
blocked.
Clean check valves and bleed dosing head.
See also "start up".
Suction valve or suction line
leaking or blocked.
Clean or seal suction line.
Suction lift too high.
- Install dosing pump at lower position.
- Install pulsation dampener on suction side.
- Install priming aid.
Viscositiy too high
- Enlarge suction and discharge line/diameter.
- Use special dosing head
>> Contact manufacturer
No stroke move-
ment observed
Stroke length set to zero.
Correctly adjust pump stroke frequency.
Diaphragm return spring
broken.
inform Lutz-Jesco service.
Fuse blown.
Check power supply voltage, contact service.
Power supply interrupted
Switch on power supply voltage.
Solenoid defective.
inform Lutz-Jesco service.
Frequent dia-
phragm failures
Diaphragm was not properly
tightened to the diaphragm
rod.
Screw in new diaphragm.
System back pressure too high.
(measured at discharge con-
nection of dosing pump)
Inspect system. Clean blocked injection nozzle.
Reduce pressure spikes resulting from extremely
long tubes by installing pulsation dampeners.
Check function of safety valves.
Media sediment in dosing
head.
Flush dosing head.
Dosing Pump
delivering too
much.
(Pump siphoning)
Pressure on suction side too
high.
Install back pressure valve or suction controller.
If the problem cannot be solved with the support of the above instructions, contact our After-Sales Service
for further assistance or return dosing pump to manufacturer. Repairs will be carried out immediately.
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| Operation & Maintenance Instructions | Troubleshooting
