optima xm alarm

After returning from holiday and entering the house, the alarm was making an unusual noise but silenced as normal when I entered the code. However, later on before going out, when I tried to set the alarm nothing happened when I typed in the code. I then noticed that a light is lit up for zone 4...

Morning all, I have an Optima XM alarm which I believe came with our house back in 1992. I moved in 6 years ago and have never set the alarm and never used it, it just sits happily. In the last couple of days the alarm box inside the downstairs toilet makes lots of strange noises, so much so...