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10. Fault finding chart
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 centre.
Fault Cause Remedy
The dosing has
stopped or the output
is too low.
Valves leaking or blocked. Check and clean valves.
Valves incorrectly installed.
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.
Suction valve or suction pipe/hose
leaking or blocked.
Clean and seal the suction pipe/hose.
Suction lift too high.
Install the pump in a lower position.
Install a priming tank.
Viscosity too high.
Select the anti-cavitation function, see
section 5.15.
Install a pipe/hose with larger cross-section.
Fit spring-loaded valves.
Pump out of calibration. Calibrate the pump, see section 7.
Pump dosing too little
or too much.
Pump out of calibration. Calibrate the pump, see section 7.
Pump dosing
irregularly.
Valves leaking or blocked. Check and clean the valves.
Leakage from drain
hole.
Diaphragm defective. Install a new diaphragm.
Frequent diaphragm
failures.
Diaphragm not fastened properly.
Install a new diaphragm and ensure that the
diaphragm is fastened properly.
Counter-pressure too high
(measured at the pump discharge
port).
Check the system. Check the injection valve.
Sediment in dosing head. Clean/flush the dosing head.
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