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Turn off/reset Accenta/Optima G3 intruder system?

Fuse has just tripped in the house and has set the alarm off when we reset the fuse.
Don't have a code for alarm so how do we reset? turn off without having to switch the fuse off again?
Currently have no power in half the house.
AmyD, January 2018
link Click here to see other fixes for Optima.