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Chirping smoke detector are usually those with low batteries.
Replacing the battery in the smoke detector is the usual remedy.
Since your smoke detector is the hardwired type, it might not even have a battery in it when opened.
And the wiring to it may have to be checked on also. And if it got dust in it, or might have, it will need to be blown out with an air compressor, to clean the sensor of fine particulate matter that also might lead to the chirping.
Check the breakers: if one is tripped, it might be depriving the detector of power (through its wiring.)