Returning the system to factory setting will only create more problems,as it will need reprogramming and may not resolve the issue after a reprogramme.
Yes all LED,s should flash except for service,power and fault when you have entered programming mode.That's your prompt for entering the programming commands.
You have successfully entered engineering because you have changed the bell delay to zero,
I would suggest you test the bells to ensure the outside sounder is at fault and not a programming error,return to user mode for a bells test.
Press 4 then Enter followed by your user code, internals should
sound for 3 SEC's followed by the outside sounder+strobe for 10 SEC,s.Perform this test and see if the outside sounder and strobe run
e manno, June 2012