Appendix C Trouble Shooting Guide - Extech Instruments CO80 Manual

Appendix C
Problem
Unit does not turn
on
shown on
display, or unit
unexpectedly
turns off
O reading "Lo"
2
after stabilising in
clean air
"High" shown on
display
Ratio reads "rnG"
Battery life shorter
than expected
"CAL" shown on
display
"Prob" displayed
Continuous alarm
sounds
Trouble Shooting Guide
Cause
Batteries are flat
Low batteries
O sensor failed
2
Over-range
reading
CO or CO2
reading is zero.
Unable to
calculate
Back light or
leak detector
has been used
excessively
Calibration
required
Instrument
calibrated whilst
probe in flue
Excessive levels
of CO
Remedy
Recharge batteries or
run on mains
Recharge batteries
Contact Extech
Remove probe from
gas source
immediately and allow
unit to run in clean air
for 5 minutes
Probe is not in the
flue/appliance not
running
Turn off back light
when not required
Contact Extech
Turn off instrument.
Turn back on with
probe outside flue
Remove probe from
flue, and allow unit to
run in clean air for 5
minutes
43 CO80 V3.1 04/06