My Fire Alarm/smoke Sensor Has Started Cheeping Every 10 Minutes Or So...

[sandyRoe]

It's a mains one so it's not the battery run down. Any ideas what's causing this?

[Gizmonster]

Mine started doing the same - it has a battery as a back up (or at least mine does) in case there's a power cut, etc. The battery needs replacing.

[Buenchico]

Mains-powered smoke alarms usually have back-up batteries in them, so that the alarm will still sound if the mains power is cut off. You probably need to change that battery:
http://www.aico.co.uk/how-to-change-the-battery-in-your-alarm.html

[chelle7272]

Does it have a back up battery that might need replacing?

[Buenchico]

I must learn to type faster!

[sandyRoe]

So it IS the battery. Thank you both.

[sandyRoe]

Thank you, all three.

[BRIGHT SPARK]

Some have a lithium cell and you cant change it.They should last 10 years.
The chirping may be a fault, or the detection chamber may need cleaning...use a vac and blow into the chamber as you vac.Is it an Aico unit.

[Clanad]

I generally agree with the other posters re: back up battery, but I was going to suggest the "Target" needs cleaning of accumulated dust, but contrary to bright-spark, the best way to clean it (it's a small, maybe 2 inch in diameter silver colored cup-shaped device where smoke particles settle to be detected) is to disable the device by pulling the correct circuit breaker or other protective electrical device, removing the cover and simply wiping the cup clean with a soft tissue. Replace the snap-on cover and turn electrics back on...