Hello,
I have just finished some work to tidy up the wiring on the Accenta Gen4 system fitted in my flat. Basically what I did was re-route a lot of the surface cabling under the floor, and also change a couple of the sensors. Now the system is up and running again it all seems to work fine, apart from the door contact.
The door used to have a surface mounted Honeywell contact, and one of the changes I made was to swap that for a flush contact hidden in the doorframe (part is CQR FC508/WH). When I test the output from contact back at the panel with a multimeter is it fine; reads 2 Ohms with the door closed and then open circuit with the door opened. However when I connect it to the panel it doesn't respond normally.
On walk test mode the panel usually shows the door contact open even when the door is closed (and the terminals on the panel read low resistance with a meter). Once or twice on walk test it has responded correctly, but when the system was next power cycled it then went back to the same problem. I have tried bridging the terminals on the panel with a bit of wire and with that done the response is totally normal.
Because both the contact and the panel seem to operate normally I do wonder if this might be interference of some kind, but I don't know of any way of checking that. If you have any ideas that I could try to fix this that would be great as it has me a bit stumped!
Cheers,
Nick