Fault description Cause Remedy
Metering pump does not work, green
LED not showing
Incorrect voltage Check power supply
Pump does not suck up despite bleeding
and max. stroke setting
deposits, adhesions or
drying-out of the valves
rinse the metering head
through the suction tube, if
necessary remove and
clean or replace the valves
Metering head is leaking, medium is
escaping from leaking connection
Metering head is loose Tighten metering head
screw diagonally
Diaphragm ruptured Replace diaphragm
Metering pump does not work, even
though ON
pressure-/suction valve
is leaking
Clean and rinse valve
Metering volume setting
too low
Increase stroke volume
setting
Metering valve clogged Clean and rinse valve
Metering back-pressure
too high
Check metering and return
lines
Once the cause of the fault has been rectified, switch the mains off again and
set the switch to "0" in order to cancel the fault alarm.
Operating faults
53 417102233 Rev. 3-03.2019
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