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How can I fix my optimal 2 plus alarm ?

My alarm is beeping and the tamper light is lit with a letter c on it and not sure how to fix it if I put the number in it doesn't do nothing but the red sensors on the walls still work
Rebecca harding, February 2017
also stands for cheap !!!!!!:-)

gts, March 2017
C indicates a tamper on the control box or keypad. fix either of these and press reset button

Alan, February 2017
link Click here to see other fixes for Plus.