I have an optima 2 plus alarm the main box is upstairs with a keypad downstairs. The power red light is flashing and beeping every three seconds on the ķeypad this happened following an interruption in the electricity supply. It will not reset and none of the keys work on either panel. Can anyone help with this problem, I can't find the instructions.

Denise Murphy, March 2017

or replace the battery much easier

gts, March 2017