Veritas 8 alarm will not set!?

Hi,

Recently put a new alarm panel in. Everything is working fine, there is 5 zones all wired to the PIRs. The bell box is wired up correctly. The appropiate zones are set to entry/exit to allow us to leave/enter the house to once we have set the alarm. ONE PROBLEM. When leaving I enter the code, and the unset light starts flashing, which I assume is normal? Then I press FULL, to full set the system. The panel then emits an error beep, the unset light stops flashing and stays on constant and the alarm DOES NOT SET! After looking through the booklet cannot find anything that resembles my problem in the troubleshooting section.

I understand that once I have pressed FULL, the panel should start emitting an exit tone and give me 30 seconds to leave the house, and then give me an entry tone and 30 seconds to re enter the code on re entry.

Can anyone please help, because as of yet I have to leave my house alarm unset due to this problem!

Cheers in advance,

Phil