P/N 3102145 (ML) • REV F • ISS 11MAR19
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Operation characteristics
LED display
Alarm sound
Unit status
Control panel status
Recommendation
Normal
operation
Green Power
LED flashes
every 30 s.
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 s silence,
repeating.
Alarm condition.
Dangerous
concentrations of
CO detected.
Alarm condition.
See
“Emergency Actions” on page 6.
Low battery /
low battery
hush
Red Alarm LED
flashes every
60 s.
One quick beep
every 60 s.
Batteries need to
be replaced.
Trouble condition,
trouble beeps every
60 s.
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 s.
Two quick beeps
every 30 s.
End of CO alarm
life.
Trouble condition,
trouble beeps every
60 s.
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 s.
One quick beep
every 30 s.
Unit is in trouble
condition.
Trouble condition,
trouble beeps every
60 s.
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.
Trouble condition,
trouble beeps every
60 s.
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
Red Alarm LED
flashes every
30 s.
One quick beep
every 30 s.
Unit is in tamper
condition.
Trouble condition,
trouble beeps every
60 s.
Place alarm body back onto mounting plate.
If condition continues, unit has
malfunctioned. Replace immediately.
