9 Operating faults / Trouble shooting
Metering pump does not
work, green LED not
showing
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
Tighten metering head screw diagonally
Metering pump does not
work, even though ON-
switch or yellow metering
display (with E20) flashes
pressure-/suction valve is leaking
Metering volume setting too low
Increase stroke volume setting
Metering pump does not
work, even though ON
pressure-/suction valve is leaking
Metering volume setting too low
Increase stroke volume setting
Clean and flush the valve
Dosing back pressure too high
Check the metering pipe and return pipe
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.