Remove a ceiling alarm by twisting it counter-clockwise. Remove a wall-mounted alarm by unplugging it from its socket. If the alarm has only one or neither marking, it is either not a carbon monoxide alarm or is not up to safety standards. Purchase a new, UL, IAS, or CSA-listed carbon monoxide detector.
Some detectors detect both smoke and carbon monoxide, and this will be clearly indicated on the manufacturer’s product page. Sometimes, detectors like these will feature two separate lights, one for a smoke alarm, and one for a carbon monoxide alarm.
Press the button again, or press and hold it again, to turn off the alarm.
If you’re moving into a new home and don’t know how old the alarms are, replace them anyway.
Some newer models of detectors have 10-year batteries out of the box that don’t need yearly replacement. If you’re not sure if this applies to your device, replace the batteries anyway, just to be safe.
If the alarm doesn’t sound, it’s faulty and needs to be replaced.
