I ran into this problem about a year after my buddy moved into a new luxury home in Orange County.
The problem is that the battery needs to be replaced! Yes, there is a battery in your hardwired smoke detector!
Since most of these are in extremely high vaulted ceilings, and very hard to get to, you want to replace the alkaline battery with a Lithium battery.
It probably takes a 9-Volt battery. Go to Frys or RadioShack or Smart & Final (they have the best Lithium battery prices here) and buy a 9-Volt lithium battery.
THEN climb up the tall ladder and opo the case open and replace the battery.
The battery is a backup power supply, in case a fire hits when the power is off (happens more often than you might think). This (battery back-up power) is a REQUIREMENT in California, part of the fire code.
Have fun!
-- Dave
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