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Symptom Possible cause Solution
Droplets left inside the tip Unsuitable tip Use original Sartorius 
tips
Leakage or pipetted  
volume too small
Non uniform wetting
of the plastic
Attach new tip
Tip incorrectly attached Attach firmly
Unsuitable tip Use original Sartorius 
tips
Foreign particles 
between tip and cone
Clean the tip cone,
attach new tip
Instrument 
contaminated
Clean and grease the 
piston and the tip cone
Insufficient amount of grease 
on a piston and o-ring
Grease accordingly 
Pipette out of 
established specifications
Instrument damaged Return to your Sartorius 
service representative
for servicing
Pipette blocked, aspirated 
volume too small
Liquid has penetrated tip cone 
and dried
Clean and grease  the 
piston and the tip cone
Tip ejector jammed or 
moves erratically
Tip ejector collar has
been contaminated
Remove and clean 
ejector collar and  tip 
cone
Continuous error
messages
Instrument damaged Return to your Sartorius 
service representative
for servicing