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Thanks for the advice. Yes, that was my next action and one was ordered yesterday. The existing sounder sounds fine on bell the test so I did wonder if the trigger output on the control board was playing up, and if anyone had anything similar occur. I am hoping it is the sounder, other than...

Hi there, My ageing Scantronics 9800+ alarm system has developed a weird fault. At night the external sounder squaks away to itself sometimes quietly, sometimes loud enough to annoy the neighbours. The control panel shows no faults, and during the day it makes no noise! Initially I replaced...