Veritas R8 alarm set not working

[viperc]

Hi, I have a veritas R8 alarm and corresponding keypad. Recently a powercut caused one of my keypads to stop working. I replaced the battery in the main alarm unit and after a reset the keypad started working but everytime I try to set the full or part alarm, the keypad seems to go into a walk test and the alarm won't set. Any idea's why this is happening and how I can get the alarm keypad to set the alarm? Thanks in advanced