Hi,
Some progress. While replacing the battery i killed all power to the panel. When it came back up all is working ok.
The problem now is that I cannot change codes, do walk test etc. Before you entered in your code, and pressed the PROG key and so on. Now after the pressing the PROG key you just get that error beep.
The prog key does work, as a ended up testing the PIRs by setting it to chime mode, a zone at a time.
Also everytime i remove the cover, and stop the alarm with the code. I have to kill all power (battery and mains) in order to clear the tamper light.
Shin, December 2008