From the user manual ....
20.1 Advice and troubleshooting
If you need advice on how to operate the Accu-Chek
Mobile meter or the Accu-Chek FastClix Mobile lancing
device, if you seem to be obtaining implausible results,
or if you suspect that the meter, test cassette, lancing
device or lancet drum might be defective, please
contact Accu-Chek Customer Care. do not attempt to
repair or modify the meter or lancing device yourself.
our staff will help solve any problems you might be
experiencing with the meter, test cassette, lancing
device or lancet drum from Roche diagnostics. The
address of the Accu-Chek Customer Care is listed in
the next section.
Wow, that has got to be the most unhelpful troubleshooting manual ever.