Do you know how many different sensors there are?
Get a pair of steps, get up to it, you'll then see how it comes apart.
BlueTac to seal the hole, and any others, where the insect got in. Should have been done when the detector was fitted. Don't forget to go around and do all the others as well or it'll happen again.
The AntiTamper should sound when you take the cover off, just go to your control panel and turn it on/off that will cancel the noise.
acorn
May 2013
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