Hi Just recently my alarm goes off when unset but only in the house.. the tamper light is flashing.. It seems to occur when a high wattage consumer is used. It then goes off every 10 minutes then stops even after consumer has been turned off. I have walk tested all pirs and seem ok and also replaced the battery on the main box. Any help will be gratefull.
Thanks in anticipation

Dougie, August 2015