6. Model 900-0230 (with digital display)
Operating Characteristics
The following table illustrates the possible digital displays, describes the
audible alarm patterns, and the recommended actions to take.
Operating and Alarm Characteristics
LCD Display Shows
Alarm Sound
Unit Status
Recommendation
A steady display of
CO concentration
from 30-999. Red
LED flashes with beep
4 quick beeps,
5 secs. silence,
repeating for 4
min.– then 4
quick beeps
every minute
Alarm condition.
Dangerous
concentrations of
CO detected
Refer to “What to do
When the Alarm
Sounds” (inside front
cover)
Brief “888” for
approximately 30
seconds
None
Self test when first
powered up
None – CO has not
been detected.
Numbers shown for
test purpose only
A random number
is displayed –
approximately 200
4 quick beeps,
5 seconds
silence,
repeated once
Test/Reset button is
pressed
None – CO has not
been detected.
Numbers shown for
test purpose only
Steady “0”
displayed, dot flashing
every 5 seconds,
Green LED flashes every 30 secs.
None
Normal DC
operation with
good batteries
(sensing no CO)
None
“Lb” flashes
alternately with any
number, Red LED
flashes every 30 seconds.
One quick beep
every 30 seconds
Batteries need to
be replaced
Replace all three AA
batteries immediately
“Err” displayed
One quick beep
every 30 seconds
Unit is Error
condition
Replace batteries.
If “Err” (or blank
display) continues, unit
has malfunctioned.
Replace immediately.
Unit will not respond
CO
Display is blank
Constant alarm Unit malfunction
Number from 11-
999 displayed.
None
Peak Level Memory
activated. Highest
concentration of
CO detected is
displayed
Refer to following
section for
information
regarding Peak Level
Memory
“End” displayed.
Red LED flashes
two times every
30 seconds
Two quick beeps
every 30 seconds
End of unit life
Replace unit
immediately. Unit will
not respond to CO.
The problems listed above are under normal operating conditions. Other
“Err” conditions could exist. If you should have any questions regarding
display conditions, call our Consumer Hotline.
