I have an "SA5 Response" wireless alarm system manufactured by Novar Electrical Devices. Most of the time it works fine, but occasionally the external siren goes off all by itself. That is, there is no actual alarm condition, and the siren in the in-house control panel does not go off.
The external siren is mounted well away from any metalwork, and I have set it to ignore radio jamming. The siren tamper switch appears to be operating properly.
I have called the Novar helpline about this, but they seem utterly clueless.
Needless to say, this behaviour doesn't go down too well with the neighbours. Has anyone here experienced this problem and found a solution?