Kidde KN-COPP-3 Owner's Manual page 18

Operation
Observe the alarm weekly to make sure the red dot is
blinking, indicating normal operation. If the dot is not
blinking, unplug the alarm, then plug in again. This will
clear the alarm for restart. If the dot does not resume
blinking, your alarm may be malfunctioning.
Blinking Dot
To test the alarm, press and release the Test / Reset button.
If the unit is operating properly, you should notice the
following:
The display shows three eights , then shows a number
(usually around 200). You should then hear 4 quick
beeps–followed by 5 seconds of silence–followed by 4 quick
beeps repeating until reset stops. The unit will then show
the three eights for several seconds. It will then return to
monitoring for carbon monoxide.
Familiarize yourself and household members with the
alarm pattern described above. In the event of a CO incident,
this pattern will continue to repeat as long as CO is present.
NOTE: Pressing the Test/Reset button tests the functions of the
alarm's internal components, circuitry and micro-computer.
YOU DO NOT NEED TO PRESS THE TEST BUTTON TO
TAKE A CO READING. CO readings are automatically shown
on the alarm's digital display. If the alarm shows zero (0), then
30 PPM of CO or less has been sensed by the alarm within the
last 15 seconds.
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