While detecting CO, the LCD will display different indicators to inform you of the alarm status, as shown below:
Mode
LCD Display LED Indicator
Runs through 8 cycles
Powering On
(yellow/green/red) in sequence.
Standby Mode
None.
Flashes green once every
(XC01/XC04)
60 seconds.
Standby Mode
Flashes green once every
(XC01-R/
60 seconds.
XC04-R)
Alarm Mode
A CO concentration ranging
from 30 to 999 ppm has been
present for a certain time
period. The blue backlight is lit,
and the LED indicator flashes
red 4 times every 5.8 seconds.
Audible Alarm
Remarks
1 quick beep.
Make sure battery insulating
film is removed and the
device is turned on.
None.
None.
None.
None.
4 beeps repeating
Dangerous CO
concentration
every 5.8 seconds.
is detected, and has
reached the alarm status.
Please refer to "What to Do
When the Alarm Sounds".
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A CO concentration level
ranging from 30 to 999 ppm
has been detected, but for
less than the allotted
detection period. The LED
indicator flashes green once
every 60 seconds.
Flashes green once every
second for 5 seconds.
Test Mode
2 sets of 4 red flashes.
None.
Dangerous CO concentration is
detected, but has not reached
the alarm status. Potential
dangerous CO conditions exist.
Please search for the CO source
first. Open nearby windows and
doors, and immediately move
to fresh air.
Alarm cancellation: when the
None.
CO concentration level drops
below the alarm threshold,
the alarm signal will stop.
2 sets of 4 quick
Peak CO level recorded since
beeps.
the previous reset.
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