On 08/09/2019 12:20, David wrote:
Every few days (I think) one or both of the mains smoke alarms cheep once.

On line search suggests that low battery should cause a regular cheep
(already experienced that and changed the battery).

There is also a suggestion that dust could cause a false alarm - but this
isn't an alarm, just a single cheep.

Has anyone else experienced this, and worked out what was causing it?

The alarms have been fitted for about 5 years.

Oh, and does everyone change their smoke alarms every 10 years?

Cheers



Dave R

I have interlinked mains ones that each have battery back up. Last year
they all started to do a once-a-day cheep. It turned out that the one in
the loft had a faulty battery.

Bill