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scantronic 9427 keeps going off?

our scantronic 9427 can go off for no reason. We key in the code & it stops the noise inside the house but the noise on the outside of the house continues. We have changed the fuse a few times in the box & this has worked in the past. However this morning it does not seem to work.
nicola, June 2015
Hi GTS, the alarm has a red light on next to the hammer, which I think is the tamper sign?

nicola, June 2015
what does the keypad say?

gts, June 2015
link Click here to see other fixes for Scantronic 9427.