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By the way, I have the tried the reset button. While this is pressed, all segments of the LCD display show. When the button is released, the controller returns back to its dead state.

I have a Landis & Gyr RBW200 central heating control panel that recently has just "died". I say died: what is happening is that the LCD display is just about readable but is very, very faint. Some of the controls appear to work (adjust clock, change on/off times) but others don't (advance and...