Handy Kev's tip, 15 Dec 2009:
Some mains-wired smoke alarms have batteries too
A lady called me because her smoke alarm was beeping with "chirrp-ing" kind of noise.
Solution: change the battery (9 volt).
How: the battery compartment is right inside the alarm, on some household models it's behind where mains electrical wiring is connected to the alarm.
If that doesn't work, here are some other things to check:
- Have there been any changes to the electrical system in the building: sometimes, work done elsewhere can disrupt things. But no, there hadn't been.
- Dust it: (blowing into the alarm with a can of compressed air is good), to remove any stray particles that might be confusing it.
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