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Not a clue. I don't think there's water involved but there may be some more gubbins in the wall as there's another plate down near the floor under the thermostat which I assume is related.
I think I might send the pics to the nice sparky I've used in the past and see if he's up for changing it. It's not urgent, been like that forever.
hippy
What's at the boiler end in terms of connection boxes and timers. That's more important than the thermostat really