I have a 10 yr old ade optima compact house alarm (6 zone). I am having some work done in the house & so the mains power needs to be switched off, when trying to do this the external siren sounds & the internal panel does not operate, there are no lights on either. The back up battery was changed about 4 years ago, so I'm wandering whether this could be my problem or could it be something else? Also can I change the battery myself or would I need an engineer?
Any help greatly appreciated.
Any help greatly appreciated.