Sorry not really an answer but if anyone could help as this is the same situation.
I have the same alarm as Fred and no code, accidently pressed a button yesterday, the alarm sounded tried turning off electric at the mains.. NO JOY kept going!
Phoned a security installer got factory setting codes and after 15 mins it went silent. The reset light is permentantly on and the tamper light is flashing.
Am I at the stage off having to call out an engineer!! :(
msfitzella
January 2011