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7 Trouble-shooting
The following table shows explanations of the error messages and tips on how to
avoid incorrect measurements.
The most commonly encountered problems are caused by:
• The test strips or cells not being inserted correctly.
• Cells being dirty or strongly scratched.
• The reaction time of the strip not being right.
• Incorrect use of the tests (e. g. strips / tests not properly stored, pH range
not cor rectly adjusted).
Problem
• No display
• Display LO
• Display HI
• Display - - -
Cause
• Batteries not
inserted properly
• Batteries are drained
• Concentration is
lower than the meas-
urement range of the
test
• Concentration is hig-
her than the measu-
rement range of the
test
• No calibration pro-
grammed
Solution
• Insert the batteries
correctly
• Use new batteries
• State the result is
smaller than the
lowest measurement
value
• Dilute the sample; do
not forget to consider
the factor for dilution
when reporting the
result!
• Calibrate instrument
Problem
• Display OPT
• Display ERR
• Display E-1
• Display E-2
Cause
• Optics or strip adap-
ter is dirty
• Optical error
• Strip adapter is
assembled incorrectly
• Surrounding is too
bright
• Strip adapter is
assembled incorrectly
• Result is not plausible
Solution
• Clean optics and
adapter and switch
the RQflex® plus 10
on and then off
again; recalibrate, see
page 26
• Clean optics and
adapter; recalibrate
instrument, see page
26; if necessary, call
customer service
• Repeat measurement
in a darker place;
if necessary, close
the lid of the instru-
ment before switching
on
• Repeat measurement
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