Ok thanks for the replies... any ideas as to what I should do first in order to sort the issue.... after completing the power off and removal of lead from battery in panel only the back box sounds so I assume the battery in front box is dead.... but I assume this bell box shouldn’t work off mains anyway....

 

 

 

 

Both boxes should sound if power is removed, this is not powered from the mains. However if in Hold-Off mode the bell will not sound anyway so this doesn't prove the battery.

Your next steps are deciding if you competent to diagnose what is wrong with it, I am assuming its just a tamper fault somewhere but you need to test it with a meter and work it out.

 

The easy way to fix it from a DIY perspective if the field wiring is ok would be to buy two new boxes they will come with colour for colour instructions.

It's likely something an engineer could repair and maybe a service check wouldn't go a miss to aid system reliability, so it's you decision on which way you wish to go.

4 hours ago, Eavesy said:

Ok thanks for the replies... any ideas as to what I should do first in order to sort the issue.... after completing the power off and removal of lead from battery in panel only the back box sounds so I assume the battery in front box is dead.... but I assume this bell box shouldn’t work off mains anyway....

 

 

 

 

I would say if you have time make a note of how it's wired, written and pictures

 

Then wire up front bell as a single unit and try and get it to work

Or if you really think it's front battery , change it, it's cheap

 

And as above can you do this right...