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Problem
Possible cause
Corrective action
Troubleshooting
Liquid is above the piston
Piston not tight
Perform a cleaning, replace the
piston/cylinder assembly
(see page 56).
Piston difficult to move
Piston/cylinder assembly is
contaminated or damaged by
crystalline deposits
Perform a cleaning, replace
the piston/cylinder assembly, if
necessary (see page 56).
Filling not possible
Filling valve stuck
Clean the filling valve. If the
valve ball is stuck use a 200 µl
plastic pipette tip to loosen it
(see page 60).
Filling not possible /
liquid is drawn back into the
titrating tube during filling
The discharge valve is
contaminated or the titrating
tube has been damaged
Clean the discharge valve or
exchange the titrating tube
(see page 56).
Air bubbles in the instrument
Instrument filled too quickly
Fill instrument slowly
Filling tube is loose or dam-
aged
Fasten the telescoping filling
tube firmly. If necessary, cut the
tube off approx. 1 cm from the
top or replace it.
Filling valve is loose or the
seal possibly has not been
inserted
Check whether the seal has been
inserted, and fasten the valve
securely with the mounting tool.
Filling tube does not dip into
the liquid
Fill up the bottle, or correctly
adjust the length of the telescop-
ing filling tube.
Recirculation tube is not
mounted or mounted
improperly
Attach the recirculation tube.
The opening must point outward
toward the bottle wall.
Titrating not possible
Discharge valve stuck
Clean or exchange the titrating
tube with its integrated discharge
valve (see page 56).
The volume delivered is
smaller than that indicated
The instrument has not been
completely primed
Prime the instrument again
(see page 41).
Seal might not have been
inserted or the filling valve is
loose
Check whether the seal has been
inserted, and fasten the valve
securely with the mounting tool.
Filling valve is blocked or
damaged
Clean, and if necessary replace
the filling valve (see page 60).
The instrument doesn’t
indicate any function
Internal error
Perform a restart: remove the
batteries, wait 1 minute and then
replace them (see page 61).