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On and Blinks
off approx every
20 seconds
AC Power is present. DC power is present
Silent Off and Blinks
on approx every
40 seconds
Off Off Alarm is powered by battery backup. AC Power is not
present. Check the breaker or fuse box for power. If the
breaker or fuse box looks normal, call a licensed
electrician for assistance.
1 beep,
1 second
pause,
4 beeps,
5 second
pause
Turns off
when the
4 beeps start
Blinks in
sync with
cycle of the
first beep
Blinks in
sync with
cycle of
4 beeps
The TEST button has been pressed. The test sequence
lasts for approximately 8 seconds after the button is
released.
4 beeps,
5 second
pause,
repeat
Off Off Blinks in
sync with
cycle of
4 beeps
Originating CO alarm - If a hazard is identified, please
take all precautions when an alarm sounds by calling an
Emergency Service and getting out of the home.
1 beep,
1 second
pause,
repeat
Turns off
when the
beeps start
Blinks in
sync with
the horn
Off
Originating Gas alarm - If a hazard is identified, please
take all precautions when an alarm sounds by calling an
Emergency Service and getting out of the home.
Horn sounds
when no
hazard is
present
On and blinks
off approx every
20 seconds
Blinks when
no hazard is
present
Blinks when
no hazard
is present
Nuisance Alarm - If there is no hazard present, verify the
alarm is mounted in the correct location (see User's
Manual, "AVOID THESE LOCATIONS" section). Reset
alarm as instructed below.
Silent On and blinks
off approx every
20 seconds
Off
The CO Alarm Silence Feature is activated by pressing
and releasing the SILENCE button on the initiating alarm
while in alarm condition. The alarm will remain silent for
approx. 4 minutes, depending on the level of CO
detected. If CO levels drop below alarm levels, the alarm
will remain silent and return to normal operation. If CO
levels remain constant or increase, this indicates
potentially dangerous situation and the horn will sound
again. Ventilate area.
Off and
blinks on
approx every
10 seconds
until reset
Off Off
POWER
GREEN LED
CO
RED LED
CONDITION OF ALARM AUDIBLE & VISUAL SIGNALS BEFORE SOLUTION / RECOMMENDATION
Silent
GAS
BLUE LEDHORN
OPERATIONAL SUMMARY
Silent On and blinks
off approx
every
20 seconds
Off and
blinks on
approx every
10 seconds
until reset
Off
The Gas Alarm Silence Feature is activated by pressing
and releasing the SILENCE button on the initiating alarm
while in alarm condition. The alarm will remain silent for
a maximum of 20 seconds. If Gas levels drop below alarm
levels, the alarm will remain silent and return to normal
operation. If Gas levels remain constant or increase, this
indicates potentially dangerous situation and the horn
will sound again. Ventilate area.
CO Alarm Latching LED Indicator - The alarm has
previously detected CO and had alarmed. Follow the
reset instructions to remove the latching LED.
Off and
blinks on
approx every
5 seconds
until reset
Silent
On and blinks
off approx
every
20 seconds
Off
Gas Alarm Latching LED Indicator - The alarm has
previously detected Gas and alarmed. Follow the reset
instructions to remove the latching LED.
Off and blinks
on approx
every
5 seconds
until reset
1 beep,
1 second
pause,
4 beeps,
5 second
pause
Turns off when
the horn starts
Blinks in
sync with
the first beep
To reset the Alarm LED's, press the RESET button for 2
seconds. This will clear the Alarm LED's and clear the
Silence mode.
MCND-401CN and MCND601CN Series only: To reset
the peak CO memory, press and hold the RESET button
for 5 seconds until the peak level is cleared. The display
screen will display "000" when the peak CO level is reset
and then return to "- - -."
Blinks in
sync with
cycle of 4
beeps
3 chirps
approx every
20 seconds
Off Off Trouble/Service Alarm. Replace the alarm.Off
2 chirps
approx every
20 seconds
Off Off End-of-Service Life Alarm. Replace the alarm.Off
1 chirp
approx every
40 seconds
On and blinks
off approx
every
20 seconds
Off Low Battery - Check to make sure the battery activation
pull tab has been completely removed, battery polarity is
correct and the battery terminals are making contact with
the alarm contacts in the battery compartment. If chirp
continues, replace the 9V battery.
Off
Silent Off Off
SOLUTION /
RECOMMENDATION