Beeping smoke alarm.

[Dunoon]

Yes I have googled this but am none the wiser.
It's a mains one with a back up 9v battery.
I have changed the battery.
I have pressed the test/reset button.
I have left the working part disconnected overnight and then put it back and it is still beeping.
Nothing is on fire and the other smoke alarms in the house are not beeping.
It' isn't actually bothering me too much but obviously would prefer it to stop.

beep

beep

beep

sorry - coudln't resist!

beep

We've got one of these. Except I can't be arsed changing the battery, and it doesn't beep often enough to be really annoying.

But if I ever get round to it, I'll let you know

faulty?

Try a different battery?

could it have become disconnected from the mains?

Right when it was taken off the ceiling last night it definitely was disconnected and stopped beeping and the green light went off. On replacing today the green light went back on so I am guessing it is connected to the mains and not just battery is making it work.
Maybe I will try taking battery out and reconnecting to mains alone.
Am loathe to buy yet another battery to try.

Test the alarm and see if it is working, if you have more than one alarm they should all go off at the same time. Turn the mains supply to the smoke detectors off and test again, this will confirm your battery condition. Do not rely on a mains supply alone, smoke/heat detectors will "chirp" when the battery is low and only use a good quality alkaline battery such a a duracell.

I did test it last night after puting new Duracell battery in and all the mains ones went off. Oh and I used that test thing on the back of the battery pack and it came up full strength.
How would I turn just the supple to the smoke alarms off or would I need to flick switch which includes them but also other things?

There will be a seperate switch in your fuseboard for the smoke detectors, this will be labelled and will only turn the detectors off and nothing else, turn this off and try the test again which in turn will prove that the batteries are fine in all your detectors. Remember to turn the power back on.

does it only detect smoke or does it do carbon monoxide as well?

I thought beeping meant the smoke detectors battery was low. When mine start beeping I just replace the battery and the noise always seems to stop.

BTW I am surprised how few people have a carbon monoxide detector.

Right I have told the agent [rented house] and they are going to send the handy man round at sme point.
Last night we took the alarm down again and noted that the lights then are not on so presumably the battery was not powering them at all. Maybe a connection or has just had it's day.
Oh and being rented the house is very well covered with two more smoke alarms and a carbon monoxide alarm.
Thanks all for your input.

Make sure the carbon monoxide detector is fitted correctly at very low level as they will be useless if fitted at high level or on a ceiling.