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

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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,
yes

and worked out what was causing it?
No.

The alarms have been fitted for about 5 years.

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

No.

Cheers



Dave R



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someone else's pocket.

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?



--
mailto : news {at} admac {dot} myzen {dot} co {dot} uk

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.

I had a long shower with the bathroom door open earlier this year. The
bloody lot went off...

They all work...

--
No Apple devices were knowingly used in the preparation of this post.

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?

Ours have produced single, random cheeps as the batteries have got low,
only progressing to regular cheeps as the battery deteriorated (it was
about a week until we got the time to get new batteries and fit them).

We also had a similar effect with a microchip cat-flap - when it took us
days to find the problem, as the sound was very low volume and difficult
to locate, sounding like it was in another room, no matter which room we
were in.

The alarms have been fitted for about 5 years.

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

Not here. The recommendation seems to have come about because some
alarms are fitted with 10-year batteries and because sensitivity can
change (it usually increases), causing nuisance alarms and prompting
people to disconnect the batteries!

As long as ours continue to keep quiet unless the toast has been burned
again, I'll trust the test function and not replace them.

SteveW

"Chris Hogg" wrote in message
...
On 8 Sep 2019 11:20:52 GMT, 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

It's not just to indicate that the alarm is working, is it,

and keep the user awake all night

great feature (not!)

tim

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?




Assuming that the OP has replaced the batteries with the correct ones I
would suggest that a detector has now failed and is not correctly
registering the batteries voltage.

As we have no idea of the make and model number of the detectors all we
can do is guess.

--
Adam

On 08/09/2019 14:10, Chris Hogg wrote:
On Sun, 8 Sep 2019 13:56:41 +0100, ARW
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?




Assuming that the OP has replaced the batteries with the correct ones I
would suggest that a detector has now failed and is not correctly
registering the batteries voltage.

As we have no idea of the make and model number of the detectors all we
can do is guess.

Do 'mains smoke alarms' have batteries?


Good question.

Grade D is the minimum requirement these days for interlinked smokes in
a new build. These do require some sort of standby back up should the
mains fail. This could be in the form of inbuilt capacitors and may not
a battery.

Grade E detection systems are mains powered without any form of battery
back up. They are frowned upon and possibly illegal to fit even though
they may be interlinked.

Grade F are battery operated non interlinked detectors. These are the
minimum requirement for all rented properties in England.

--
Adam

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.


--
mailto : news {at} admac {dot} myzen {dot} co {dot} uk

On 08/09/2019 14:10, Chris Hogg wrote:
On Sun, 8 Sep 2019 13:56:41 +0100, ARW
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?




Assuming that the OP has replaced the batteries with the correct ones I
would suggest that a detector has now failed and is not correctly
registering the batteries voltage.

As we have no idea of the make and model number of the detectors all we
can do is guess.

Do 'mains smoke alarms' have batteries?

yes.

Essentilly on very low trickle charge all the time. AIUI


--
Its easier to fool people than to convince them that they have been fooled.
Mark Twain

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

On 08/09/2019 15:32, alan_m wrote:
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.

Not many detectors work with rechargeable batteries.


--
Adam

On Sunday, 8 September 2019 12:20:55 UTC+1, David WE Roberts (Google) 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.

Almost certainly a dying battery. Battery current output ability depends on temperature, hence it sometimes happens in the night only, at first.


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

Cheers

I'm sure they don't


NT

I don't, but I guess that depends on how they work. The radioactive ones
must decay surely?

Do they cheep in unison or just randomly?
Brian

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"David" wrote in message
...
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

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It would be very annoying if you had quite a few and they all did it at
different times though.
Brian

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The Sofa of Brian Gaff...

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Note this Signature is meaningless.!
"Chris Hogg" wrote in message
...
On 8 Sep 2019 11:20:52 GMT, 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

It's not just to indicate that the alarm is working, is it, a bit like
the continuous beeping they have in places like Sellafield?

--

Chris

Brian Gaff wrote:

The radioactive ones must decay surely?

Yes, but with a half-life of 432 years

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?

Combination of low battery and low temperature usually. Typically they
cheep sometime during the night when your just half aware of it. When the
temperature rises during the day they cease cheeping as the battery voltage
rises above the alert threshold.

Then you forget all about it until the next cold night. ;-)

Tim

--
Please don't feed the trolls

On 08/09/2019 19:37, wrote:
On Sunday, 8 September 2019 12:20:55 UTC+1, David WE Roberts (Google) 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.

Almost certainly a dying battery. Battery current output ability depends on temperature, hence it sometimes happens in the night only, at first.


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

Cheers

I'm sure they don't


Fire brigade will fit free ones for the elderly with a free
non-endearing lecture about reducing clutter and flammable items in the
home.

Which is why a relative hasn't called them back to fix the deafening
chirping - not being appreciative of being told how to live ...

(I'm going to sort this out)

--
Adrian C

On 08/09/2019 20:35, Andy Burns wrote:
Brian Gaff wrote:

The radioactive ones must decay surely?

Yes, but with a half-life of 432 years

Stiflers mother?

--
Adam

On Sun, 08 Sep 2019 19:45:06 +0100, Brian Gaff wrote:

snip

Do they cheep in unison or just randomly?
Brian

One is upstairs and one downstairs so it is difficult to tell, but I
suspect that they both chirp at once.

Cheers



Dave R



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ARW wrote:

Andy Burns wrote:

Brian Gaff wrote:

The radioactive ones must decay surely?

Yes, but with a half-life of 432 years

Stiflers mother?

That's a whoosh here, never watched the film ...

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?



Alarm or Occupier ?