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Smoke alarm made screeching noise

My home has three smoke alarms, backed up by the mains electricity installed by the builders, 7 years ago. Each of them has had its battery replaced about 5 times each.

In the small hours of this morning. I got woken up by one of them screeching with a gap of 5 seconds. It wasn't the low battery chirp, which sounds every 40 seconds.

So I removed the alarm and battery from the alarm and it screeched twice more (a little quieter though)without the battery:eek: I thought it was going to go on forever.

What caused this? Is the battery gone? Is the smoke alarm gone?

Comments

  • Biggles
    Biggles Posts: 8,209 Forumite
    1,000 Posts Combo Breaker
    What does the manual say about audible warnings?
  • peachyprice
    peachyprice Posts: 22,346 Forumite
    Part of the Furniture 10,000 Posts Name Dropper
    Is it a combined smoke/CO alarm?
    Accept your past without regret, handle your present with confidence and face your future without fear
  • System
    System Posts: 178,403 Community Admin
    10,000 Posts Photogenic Name Dropper
    The manual says nothing and I don't have gas.
    This is a system account and does not represent a real person. To contact the Forum Team email forumteam@moneysavingexpert.com
  • Le_Kirk
    Le_Kirk Posts: 25,864 Forumite
    Part of the Furniture 10,000 Posts Photogenic Name Dropper
    edited 1 August 2016 at 8:43AM
    How old is the smoke alarm? Some of them require changing every few years (well at least the sensor) check to see if there is a label stuck inside or the original instructions leaflet/manual.
  • Kynthia
    Kynthia Posts: 5,692 Forumite
    Part of the Furniture 1,000 Posts Combo Breaker
    Ours would loudly beep when the back - up battery came loose. Putting back in firmly solved the problem.
    Don't listen to me, I'm no expert!
  • System
    System Posts: 178,403 Community Admin
    10,000 Posts Photogenic Name Dropper
    Le_Kirk wrote: »
    How old is the smoke alarm? Some of them require changing every few years (well at least the sensor) check to see if there is a label stuck inside or the original instructions leaflet/manual.

    Seven years old
    This is a system account and does not represent a real person. To contact the Forum Team email forumteam@moneysavingexpert.com
  • Risteard
    Risteard Posts: 2,000 Forumite
    Part of the Furniture 1,000 Posts Name Dropper
    My home has three smoke alarms, backed up by the mains electricity installed by the builders, 7 years ago.
    Firstly they are not "backed up by the mains" - they are mains powered with battery backup (which is known as a Grade D system).

    Secondly, I hope they were installed by an Electrician and not a builder!
  • Risteard
    Risteard Posts: 2,000 Forumite
    Part of the Furniture 1,000 Posts Name Dropper
    Le_Kirk wrote: »
    Some of them require changing every few years
    ALL of them require replacement - typically after 10 years.
  • dj1471
    dj1471 Posts: 1,969 Forumite
    Part of the Furniture 1,000 Posts Home Insurance Hacker!
    I've had this before, it was caused by dust in the sensor, try giving it a good vac. For some reason it would always happen when the sun hit it in the morning which I never did understand!

    I'd also test it to make sure it still functions, if in doubt replace it.
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