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How to turn of tamper alarm on Logic Six house alarm?

I moved into the house over 2 years ago and have never touched it nor do I have a fob. It's never done anything before but for some reason turning off the downstairs lights circuit has triggered it and now I can't turn the lights back on without the internal and external siren ringing.
Bob, July 2023
Back up battery obviously dead. Should be an unswitched fused spur adjacent to alarm panel. Alarm panel is obviously on the lighting circuit, remove fuse from the fused spur which will allow you to turn on lighting circuit again. If no fused spur then you could remove the internal fuse in the control panel this would prevent the panel powering up. Better though if panel is wired direct to the consumer unit then disconnect it there. unless you are competent, you will need the services of a competent person to disconnect the wiring at the consumer unit.

Alan, July 2023