try resetting the panel to factory default...
disconnect backup battery, switch of mains supply.
hold in the tamper switch on the panel .. reconnect battery and within 5 seconds of powering up press reset . reset . the sounder should then bleep. refit the cover, reconnect the mains. enter code 0123 and the system should go to day mode. now immediately enter the engineer code (prog 9.9.9.9.)
I can supply you with programming info if you need it, post your email addy here and I will send to you.
Pete., March 2007