t/a has been set off?

Hi, i was trying to be clever by slightly moving one of the sensors (to get a better angle). This unfortunatly has set off the t/a.

The keypad seems to be on lock-down and the warning lights including t/a has been triggered.

I've tried putting in my code... but it kicks me out. I've read that you can put in an engineers code (9999) it seems to accept that no.s... but i'am lost as to what to do next??

Please help!!