Hello ipf,
I am guessing that the problem is the Alarm Control Box RF Receiver - as I am not at all experienced in `Electronics` I would not have the `PCB soldering expertise` or the `precise manual dexterity` to go about replacing that - even IF I could source the exact component to replace it.
If it could be replaced all the detectors connected within the Control Box would have to be un-wired and also the Siren Box cable / Siren Box cable protector and the 235 volt supply disconnected - the Control Box removed from the wall to be worked on.
Far too much `messing about` compared to gluing some Alarm cable to UPVC architraves.
I think that I have seen it within the Control Box / on a fairly big PCB and it definitely does not look like a `DIY replaceable component`.
With the exception of replacing / hard wiring detectors my Home Alarm system is far too old for any Control Box spares to be available - I believe that the Manufacturers [Yale] considered it to be `obsolete` about 10 years ago regarding no more spares or wireless detectors being available.
Apart from various problems with detectors failing and RF Interference issues in the past the Alarm has worked for about 20 Years - I am guessing that is pretty good for any Domestic Alarm system ?
During those years usually to either overcome RF Interference or replacing malfunctioning / unavailable Wireless detectors I have had to hard wire various detectors to the Control box.
On this occasion it seems that the Alarm Control Box RF receiver has malfunctioned so I now have to get rid of the remaining Wireless Window and Door detectors and hard wire magnetic contacts to available connections in the Control Box.
It would be nice to have a new House Alarm Control Box but can You really recommend that regarding the fact that I am hoping to solve my Alarm system problem with a £5.00 or £6.00 tube of glue ?
Chris