When 200 Appears on Your Carbon Monoxide Alarms Display
July 30, 2008
Any time you push the Test/Reset button the unit will go through a series of test numbers that are programmed into the unit to test the internal diagnostics of the unit. This will start out with an 888 reading, then display numbers usually in the 200 ranges, then back to 888, and back to zero. They are not actual readings so you should not be alarmed and do not need to take any further action.