On 08/09/2019 13:31, The Natural Philosopher wrote:
On 08/09/2019 13:20, alan_m wrote:
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).

End of life warning?



Nope. A bit of reaearch suggests its not a low battery, but it could be
dust, or a failing sensor.


With a bit of research, on some main powered and battery backed up
detectors multiple beeping every 40 seconds (rather than once every 40
seconds for low battery) is an end of life indication.

Also if the replacement battery was a rechargeable type the detector may
beep during the first few days until fully charged.

With my battery alarms I often get the first signs of a low battery a
few times at night when its colder but by morning when perhaps the
heating comes on the battery recovers a bit and the beeping stops. I now
put a label on the units giving the date when the battery was changed.


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