The controller had arrived. I replaced the controller. The old controller must have been 7-8 years old. I was trying to find a moulded plastic data stamp. The old controller was the same model but of a different frequency.
The new controller does not fit in the same back box, so I had to remove the back box. When I isolate the controller, the neon on the fuse spur is still lit, so I double checked there was no voltage before I touched the wires.
I reprogrammed some of the settings on the boiler now. It has been a good exercise to learn about my boiler. Let's hope I don't have to worry about it again for the next 8 years.
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