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Thanks for the advice. So i ordered a new bell box and battery and after replacing the new battery within the main alarm unit my external sounder started working within the old bell box? Surely the sound should also work off the mains supply alone and hence get sound form the bell box even when...

Hi guys I expect this may be a basic question however it has come to my attention that the sounder is no longer working on the DIY install I did 8 years ago when I moved in. There is still some light from the strobe when the alarm is triggered however no evident sound. It's an ADE Reson 8. I...