Galaxy 8 Question?

After a prolonged loss of power and some replaced PIRs my Galaxy 8 alarm had lost it's memory. I have reprogrammed it, and the walk test and tamper test all work great.

But... when I set the alarm as soon as the 'system set' message appears, the outside box bell rings.

There are no errors or messages in the log, what could the fault be?


Thanks in advance
Tony