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Part Six – Display Reading and What They Mean
Start-up and Normal Operation Readings
Page 6-3 and 6-4 contain vital information about the various readings you may
see on your display. We suggest you keep this User’s Guide handy for reference.
Your new Nighthawk carbon monoxide alarm is a sophisticat-
ed electronic device – yet very simple to understand. Basically,
the unit will display a “0” if it does not sense carbon monox-
ide and if you have a good 9V backup battery installed.
If it senses carbon monoxide, it will display a reading so you
can see if you have a non-threatening or emergency situation.
However, if the backup battery is low or missing, or if the unit
malfunctions it will display other readings (and alarm differ-
ently) to alert you that something is wrong with the
alarm.
Please familiarize yourself and other family members to the
difference between a CO reading and a reading signifying a
problem with the
alarm itself.
Display Shows Alarm Sound Unit Status Recommended Action
Brief “888” and One short “chirp” Self checking when AC powered None – Unit should quickly
flashing dot return to zero.
“Lb” and dot One short “chirp” Start-up or reset phase when Install or Replace 9V battery
flashes alternately every 15 seconds. AC powered and low battery Refer to page 1-4.
with “0”.
Steady “0” None Normal AC operation (sensing None
and flashing dot no CO) and with good battery
Steady display of 4 quick beeps, High level of CO detected Refer to page 4-1
high number (in the 5 seconds off,
hundreds of ppm) repeat.
and flashing dot
(flashes alternately)
6-3
If at any time you test the alarm and it does not perform as described, have it replaced immediately.
810-1368 AC PP 12/99 8/24/00 2:06 PM Page 21