smoke alarm just beeped twice

[mckenzie]

it did it the other day (I now realise that's what it was. I remember hearing the noise and couldn't place it but this time I'm sure). Ive checked the booklet and there is a trouble shooting page but it doesn't mention just two beeps. Any ideas what it could be? It's a Kidde Fyrnetics one.

TIA

Batteries need replacing?

Batteries probably.

batteries

Definitely batteries need changing

another vote for batteries.

And even if it is a mains one, they have back up batteries- last about 10 years and then they go.

and then start to beep at 4 in the morning when you are really sleep deprived with a 4 week old baby. Bitter

Ive just managed to get hold of DH at work. Apparently they are mains ones but with battery backup. There's no light on the unit at all though. We have one on every floor and none of them are have a light on of any sort. The power everywhere else in the house is fine and I've just checked the fuses and they don't have their own one as far as I can see.

sorry FF, I typed before I saw yours. Ok, batteries it is then. Thank you all