BRK electronic CO5120PDB - Manual (Page 5)

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If battery becomes low or is missing
*Note: If the battery becomes very weak, you will
hear extra “chirps.” Replace the battery immediately!
Disconnect AC power before changing battery.
Shock hazard exists if AC power is miswired.
If the CO alarm is not operating properly
Horn Three rapid chirps
every minute
Display Displays “Err”
POWER/ Flashes three
ALARM Light times in sync with
the horn
Horn Chirps once
a minute*
Display The word “bat”
flashes on and off
POWER/ Flashes once a
ALARM Light minute
What You See and Hear Under Different
Conditions (continued)... WHAT YOU SEE AND HEAR IF CO IS DETECTED
Pre-Alarm Levels
Horn Silent
Display Shows CO levels
detected in ppm
POWER/ Shines
ALARM Light continuously
Alarm levels of CO are detected (Over 70 ppm)
Horn Sounds loudly -
4 beeps, pause,
4 beeps, pause.
This sequence
repeats for as
long as the unit
is in alarm*
Display Shows CO levels
detected in ppm
POWER/ Flashes once
ALARM Light per second
*Note: If unit goes into alarm under battery back-up
power, the regular 4 beeps-brief pause cycle will
repeat for four minutes. After four minutes, the pause
will increase to 1 minute.
Continued)...