Safety & Detection Error Codes

No detectable CO — CO concentration is below 10 PPM and displays as 0 PPM on LCD.

Alarm condition activated — one complete alarm cycle with the alarm indicator flashing 5 times accompanied by audible beeps.

Alarm activation pattern — the alarm sounds 3 times every 10 seconds during alarm condition.

Battery status sufficient — batteries have adequate charge for normal operation.

Battery status normal — batteries are in normal operating condition.

Battery status low — battery charge is declining but still functional.

Low battery warning — battery voltage has dropped below 3.6V and is inadequate for continued operation.

Power-up confirmation — displayed when batteries are installed and the alarm is powered up successfully.

Device end-of-life indicator — the alarm has reached the end of its 10-year operational lifespan.

Sensor fault detected — the sensor or circuit has a malfunction.

Continuous fault notification — fault warning is repeated at least once every minute until the fault is resolved.

Fault detection — fault warning is given within 3 minutes of a malfunction being detected.

Dangerous CO concentration level — carbon monoxide concentration exceeds 550 PPM.

Low-level CO detected — warning given when CO concentration is between 30-40 PPM for extended periods.

Normal operation status — power indicator blinks at 45-second intervals during normal operation.

Alarm silenced — alarm is in silent mode where indicator flashes but audible beep is temporarily suppressed.

Test mode active — test icon appears on LCD when TEST button is pressed.