changed battry?

hi all
after changing the battry in a scantronic 9800.
i have two key pads one ustairs and one downstairs the upstairs one i keyed in 99 and then my No and every thing ok set the alarm for downstairs went down and it went off good .
so i keyed in my no to stop the alarm it stoped but alarmed itself again and it does that every time how can i unalarm it

salvatore zammito
March 2011

why?

acorn
March 2011

~What, why?

Alarm
March 2011