Why does my CO alarm (carbon monoxide) keep chirping after replacing the battery?
Thursday, January 9, 2020
If that annoying chirping just won’t stop, even after you replaced the battery, it is probably the “end-of-life warning” for the CO alarm. Underwriters Laboratories (UL) began requiring in 2009, as a condition for gaining a UL rating, that manufacturers alert homeowners when their carbon monoxide alarm has reached the end of its useful life.
The clock starts when you first power up the alarm, and the lifespan rating varies from 7 to 10 years. When time runs out, each manufacturer alerts you a little differently. First Alert’s signal is five beeps every minute, for example, while Kidde’s end-of-life is a chirp every 30 seconds. If there is a digital display, you may see an ERR or END code.
The beeping will keep going until the alarm is out of power or, for models with an end-of-life hush feature, the alarm can be silenced for 3-day intervals for up to 30 days. Also, the combo CO and smoke alarms will have the same end-of-life beeps too.
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