Accenta G3 mini (does not see 2 PIRs)

[Forty_Two]

My alarm system (Accenta G3) was installed a long time ago (maybe 20 years). The system was working fine until I changed the battery. (A recent power cut caused me to realise that the battery was dead). I did my research and bought a like for like battery. I installed it and when activating the alarm 2 of the 5 PIR’s come us faulty (I can see that the two PIRs in two rooms on the ground floor are not lit up). I can set the alarm by ‘omiting’ those two PIRs. I presumed I must have dislodged a wire when I had put in the new battery. I took the front off the alarm box and cannot see any loose wires.


Because all was good before the new battery I am presuming this is something simple but, of course, I don’t know - any ideas


TIA

 

[secureiam]

I can see the PIR's are labelled.
If the all PIR's were working beforehand and only two not working now the chances are when you replaced the battery, you pulled a power cable out.

I would take out the battery.
find the two pirs and follow the cables to try and find the appropriate cores.

Unfortunately its a right birds nest so you must be careful, as you may pull more wiresout trying to sort through the mess

 

[secureiam]

I can see that there are 1 red wire to AUX plus (13V terminal) and 3 black wires to 0V.

I would suspect the two twisted reds maybe the cores your looking for that are going to the speaker, as two of the blacks going to 0V are also twisted.

But I would trace the cables to make sure before moving.

 

[Forty_Two]

Thanks for the helpful replies . . . . do I need to switch off the 250volt mains supply before touching those small thin wires?

 

[secureiam]

Safety first.

many engineers wouldn’t down power but they would take care not to touch live mains.