Burglar alarm sound out? I have fitted a burglar alarm contained by my house. Turned it...

I have fitted a burglar alarm contained by my house. Turned it on and all worked.
Then i lately found out that when i trigger a tamper..ie remove a PIR head or remove the front control box cover later the strobe on the outside box activates but the siren does not!!!!
Any design????
Have a circuit breaker surrounded by the shed....
Answers:    Without knowing more abuot your system, then no.

It is possible you are still contained by installation/admin mode and it isn't 'live' yet. Normally within is a mode you can set it for maintenance ie so you can correction the batteries in need it ging off.
What might effect a bright gas Furnace to...
ask a local poacher to burgal your house that'll test if it works or not...