Should a carbon monoxide detector have a light on it?
On First Alert carbon monoxide alarms, the red light flashes to show the CO alarm is properly receiving battery power. If you do not see the red light flashing, change the batteries in the alarm immediately.
How long does it take for a carbon monoxide detector to detect carbon monoxide?
It can take a standard carbon monoxide detector one hour to alert at concentrations of 70 ppm and below. CO detectors will respond to extremely high concentrations of 400 ppm and above in as little as four minutes.
What happens when you press test on carbon monoxide detector?
Pressing the test button only reveals whether the batteries are fresh enough and if the appliance is getting power. You're really only testing the siren. It doesn't tell you whether the device will detect a dangerous concentration of carbon monoxide.