Fault Finding Chart - Grundfos DME Serie Instrucciones De Instalación Y Funcionamiento

10. Fault finding chart

Fault
The dosing has
stopped or the output
is too low.
Pump dosing too little
or too much.
Pump dosing
irregularly.
Leakage from drain
hole.
Frequent diaphragm
failures.
11. Disposal
This product and all its associated parts must be
disposed of in an environmentally friendly manner.
Use appropriate waste collection services. If there is
no such facility or the facility refuses to accept the
materials used in the product, the product can be
sent to the nearest Grundfos company or Grundfos
service center.
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Cause
Valves leaking or blocked.
Valves incorrectly installed.
Suction valve or suction pipe/hose
leaking or blocked.
Suction lift too high.
Viscosity too high.
Pump out of calibration.
Pump out of calibration.
Valves leaking or blocked.
Diaphragm defective.
Diaphragm not fastened properly.
Counter-pressure too high
(measured at the pump discharge
port).
Sediment in dosing head.
Subject to alterations.
Remedy
Check and clean valves.
Remove and fit valves. Check that the arrow
on the valve casing is pointing in the liquid
flow direction. Check that all O-rings have
been fitted correctly.
Clean and seal the suction pipe/hose.
Install the pump in a lower position.
Install a priming tank.
Select the anti-cavitation function, see
section 6.15 Anti-cavitation.
Install a pipe/hose with larger cross-section.
Fit spring-loaded valves.
Calibrate the pump, see section
Calibrate the pump, see section
Check and clean the valves.
Install a new diaphragm.
Install a new diaphragm and ensure that the
diaphragm is fastened properly.
Check the system. Check the injection valve.
Clean/flush the dosing head.
8. Calibration.
8. Calibration.