I have the same problem My Accenta6 system is 12 years old,installer is no longer trading.Alarm goes off intermittenty stays sounding untill I reset system, Tamper indicator shows untill reset.Also intermittently sounds at the control box when system is not set tamper indicator shows.
I have had solar panels fitted on roof could it be the incoming electric that is upsetting system?all help very welcom thanks
Chris, June 2012