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usually the cherping means there is a low battery. but you say it is hard wired. why not tpe a plastic freezer bag over it. if it still cherips then check to se if it really dose have a battery. if not take it down and put it a drawer. i had one in my trailer once that kept going off and nothing i did worked. when i took the cover off there was a spider in it . it must hae been tuching somthing inside to make it go off . i got rid of the soider and the thing shut up. so this is a possiblity too. i know how adrovating that can be i hope you find a solution . but if not a hammer would be justfied. been there done that too.
Like the other guy said replace the back up battery and it will be fine. Putting a plastic bag over it is likely to set it off.
There are three possible causes: 1. The backup battery is dead. Replace the battery. 2. Dust or other foreign matter is activating it. Open the cover and blow it clean with air or vacuum it. 3. They do go bad and need to be replaced. If none of the above work, replace it. Never defeat an alarm because it won't be there for you when you really need it.
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I have gone through the same thing, but in my case it sounded the alarm which was also connected to 6 more in the house. I replaced the battery and that didn't help, so just in case the new battery was bad I did it again, but to no avail. Smoke detectors are good for about 5 years then should be replaced. The thing will just turn and come loose from the box it is attached to, but since you don't know where the breaker is I would suggest having an electrician replace it because it will have to worked hot
