Mark C

All sorted now with a new detector and a good clean of the keypad. For anyone finding this post the fire detector can be linked out with a 2.2k resistor. Thanks again, £19 was a cheap fix.

Thank you Mr happy it was the key pad in the Annexe stopping the comms, I disconnecting Data and Clock from it and the others came back to life. When you exit installation mode it flags Z13 open which is the smoke alarm next to the faulty keypad. I popped the top off and it has clearly had water in it. I suspect the bathroom above had a leak at some point and did for them both. Because of the open fault on Z13 I can't go any further. I have ordered a new detector and keypad but can I link out Z13 with a wire or resistor? Thanks again I am chuffed it lives.

We have just purchased a property that has been empty for 5 years and the batteries were all dead after the electricity was disconnected from the Cooper Security 9853. The main 9853 box has a 17ah battery and this has been changed and the separate power supply has also had its battery changed. I haven't changed or looked at either of the 2 external alarm boxes yet. Please do not post defaulting information in the public forums Both keypads display "Ver 4.00 Feb15 2007" (this happens as soon as you reconnect the battery) which I assume is the software and it's build date but nothing else. It chimes twices when it powers up and responds to the keypresses. The first 6 keypesses are greeted with normal beeps and aftert at the beeps turn louder and deeper like errors. A couple of times the countdown timer beeps have started but it never alarms it just keeps beeping. So it has had new batteries, the reset procedure has been followed but will it reboot? Will it heck as like reboot. Any ideas peeps.....