Appendix D : TROUBLESHOOTING GUIDE
Problem
Probable Cause
Possible Remedy
Unit does not turn on
Batteries are flat
Recharge batteries or run
on mains.
Unit does not turn on
Dislodged battery
Disconnect and Re-
connect battery
Continuous alarm
Sounds
Excessive levels of
CO are being
detected
Remove probe from flue
and run in clean air for
5/10 minutes
Negative pressure
readings on Display
Pressure tubing
connected to wrong
pressure port
Reconnect pressure tubing
to positive pressure port
rather than negative
pressure port
Negative pressure
readings on display
Either there is suction
or pressure was not
zeroed in
atmospheric air
Re-zero in atmospheric
air.
Negative temperature
readings on display
Thermocouple plug
has been plugged in
the wrong way round
Remove thermocouple
plug and plug in the
correct way round
“Flo Err” is displayed
Blockage in sampling
probe or
kink/blockage in
sample tube
Check and rectify as
necessary
“Flo Err” is displayed
Dirty/blocked filters
Remove and replace in-
line filters
Battery life shorter
than usual
Excessive use of
backlight or leak
detector
Turn off backlight when
not needed
“InIt O2 Err” is
displayed
Instrument turned on
in contaminated air.
Turn instrument off and
then turn instrument on
again in clean air.
“InIt CO Err” is
displayed
Instrument has
turned off with Gas
Sample still present
Run instrument in clean air
until after turning the
instrument on/off the error
disappears. Depending on
the level of CO present
this may take up to 1 hr.
