Err you failed to thank gts,after all the primary fault was the battery,
No need to thank me given the fact I told you to throw it in the bin but your thanks are much appreciated,so thank you :),
Now the code change:
Press PROG then enter 0123,
Press 8 then enter the code you used before,
The panel will beep twice then press reset twice and that's it.
All the best regards e manno
e manno, May 2013