466-2411 REV A May 2011 5
Operation characteristics
Table 2: Operation characteristics
LED Display Alarm sound Unit status Control panel status Recommendation
Normal operation Green Power
LED flashes
every 30
seconds.
None. Normal DC
operation (sensing
no CO) and with
good batteries.
Normal operating
condition.
None.
Carbon monoxide
alarm
Red Alarm LED
flashes with
beeps.
Four quick beeps,
5 seconds
silence,
repeating.
Alarm condition.
Dangerous
concentrations of
CO detected.
Alarm condition. See “
Alarm procedure” on page 8.
Low battery /
low battery hush
Red Alarm LED
flashes every
60 seconds.
One quick beep
every 60
seconds.
Batteries need to be
replaced.
Trouble condition,
trouble beeps every 60
seconds.
Replace all three AA batteries.
Press Test/Hush button and release.
This will silence the low battery audible
chirp between 8 and 11 hours allowing
for a more convenient time to replace
the batteries.
Alarm end-of-life
indicator
Red Alarm LED
flashes two
times every 30
seconds.
Two quick beeps
every 30
seconds.
End of CO alarm
life.
Not applicable.
End-of-life events are
not communicated to
the control panel.
Press the Test/Hush button and
release. This will silence the end-of-life
signal for up to three days. After three
days, the unit will resume end-of-life
chirps. Hush mode will silence the
alarm ten times or up to 30 days. After
30 days, the unit can no longer be
hushed. Replace the CO alarm
immediately. The unit will not respond
to CO.
Trouble/service
alarm
Red Alarm LED
flashes every
30 seconds.
One quick beep
every 30
seconds.
Unit is in trouble
condition.
Not applicable.
Trouble/Service events
are not communicated
to the control panel.
Replace batteries. If condition
continues, unit has malfunctioned.
Replace immediately. Unit will not
respond to CO.
Error condition Red Alarm LED
constantly on.
Constant alarm. Very low battery or
unit malfunction.
Not applicable.
Error conditions are
not communicated to
the control panel.
Replace batteries. If condition
continues, unit has malfunctioned.
Replace immediately. Unit will not
respond to CO.
Test mode Red Alarm LED
flashes with
beeps.
Four quick beeps,
5 seconds
silence, repeated
once.
Normal operation
when Test/Hush
button is pressed.
Sensor test mode
CO not detected. Alarm for test
purposes only.
Tamper
a
Red Alarm LED
flashes every
30 seconds.
One quick beep
every 30
seconds.
Unit is in tamper
condition.
Not applicable.
Tamper events are not
communicated to the
control panel.
Place alarm body back onto mounting
plate. If condition continues, unit has
malfunctioned. Replace immediately.
a. Local indication starts 3.5 minutes after the unit is removed from the mounting plate.
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