Towards the end of last week, my smoke alarm started beeping. This usually means the battery needs changing, except this is a mains powered one. I've checked the fuse and supply, and all is well, yet the bloomin' thing is still beeping.
At the moment it's wrapped in a towel in one of the kitchen cupboards (so I can't hear it as much). Clearly not the intended location for a smoke alarm, but it'll have to do until I can sort it out properly.