[Accenta 7 quick power cut alarm/then no status lights?]

I had the same situation on my accenta 7 but not after power cut.

The fuse had gone.

4 easy to replace fuses. Three fuses close to each other : strobe, sounder and battery fuses. Keypad fuse top left. Used 5amp fuse as V temp fix before getting 1amp one (yes I know why it's important to use correct fuse ...)

To cancel tamper Light Replace front ! Return mains power and enter code on keypad.

 

2. situation 2 after power cut keypad on accenta 7 , although buttons illuminated , didn't work.

a. turned off mains Power.

b. Open front of Accenta main unit. Opens like a door to left, don't try first to lift off.

c. Carefully remove battery fuse. Replace fuse, alarm warning sounds you can enter code on keypad.  This process simply and easily reset the system for me. 

d. Tamper light  showing on the keypad and buttons won't work 

e. Replace the cover and enter code. 

f. Restore mains power.

Alarm Reset and working .