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All sorted now with a new smoke detector and a good clean up of the keypad. Thanks again for the tips.

There are 2 resistors in series in the smoke detector base. One is a 2.2k and the other a 4.7k. Picture attached with all the lovely rusty bits. do I just put a 2.2k across the sensor pins in the controller? Thanks again. Picture is at...

Thanks guys and 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...

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...