En
gl
is
h (
G
B)
38
9. Fault finding chart
10. Disposal
This product or parts of it must be disposed of in an
environmentally sound way:
1. Use the public or private waste collection service.
2. If this is not possible, contact the nearest
Grundfos company or service workshop.
The crossed-out wheelie bin symbol on
a product means that it must be
disposed of separately from household
waste. When a product marked with this
symbol reaches its end of life, take it to a
collection point designated by the local
waste disposal authorities. The separate collection
and recycling of such products will help protect the
environment and human health.
See also end-of-life information at
www.grundfos.com/product-recycling.
Fault
Cause
Remedy
The dosing has
stopped or the output
is too low.
Valves leaking or blocked.
Check and clean the 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
Install a pipe/hose with larger cross-section.
Fit spring-loaded valves.
Pump out of calibration.
Calibrate the pump, see section
.
Pump dosing too little
or too much.
Pump out of calibration.
Calibrate the pump, see section
.
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.
