12
Troubleshooting Guide
Problem
Solution
1
The
Display
measurement
shows
****
after
a
sample
Value
is
higher
than
5%
oxygen.
You
cannot
measure
oxygen
in
fresh
air
(21%).
2
The
PWR
lights
do
not
light
up
after
switching
on
Does
the
display
show
the
main
screen?
The
LED
light
may
be
broken,
but
unless
there
is
an
error
on
the
LCD
in
most
cases
the
device
is
not
charged.
3
The
Display
shows
BATT
Battery
is
uncharged.
4
The
Display
remains
black
after
switching
it
on
Charge
the
device
and
try
to
switch
it
on
again
Did
you
disconnect
your
device
properly
from
the
Computer
the
last
time?
Yes:
The
battery
might
be
empty.
No/
I
do
not
know:
Contact
CO2Meter
.
6
The
device
is
connected
to
the
power
supply,
but
the
BT
light
does
not
light
up
If
the
device
is
switched
off
while
connected
to
a
power
outlet,
the
BT
light
does
not
light
up
while
the
device
is
charging.
7
The
device
is
connected
to
the
Computer,
but
I
cannot
find
it
You
must
switch
on
the
device
before
connecting
to
the
computer.
If
the
device
is
switched
on
but
you
cannot
find
it,
check
for
available
COM
ports.
8
The
measured
value
is
not
saved
Did
you
press
the
LOG
button?
Did
you
observe
the
LOG
sign
on
the
display?
If
yes,
contact
CO2Meter
.
9
The
log
file
shows
a
wrong
date
The
log
file
shows
a
wrong
time
Check
the
date
and
time
on
the
device
is
set.
To
change
date/time
see
the
manual.
10
The
measured
value
varies
between
two
measurements
Give
the
TecPen
time
to
acclimatize
between
different
rooms
or
temperatures.
11
The
device
is
not
measuring
Example:
Can
you
hear
the
pump?
Yes:
Did
you
follow
operation
procedure?
Yes:
Contact
CO2Meter
.
Is
the
display
showing
MEAS?
No:
Start
the
measurement.
Yes:
Check
screen
4
if
there
is
a
value
of
amplitude
higher
than
0.
If
yes,
contact
CO2Meter
.com
