worcester digistat?

Our worcester rf digistat dt10 mk1 seems to be on the blink - it is still working, but seems a bit inconsistent. It's the 24 hr / 3 setting version, and is only 2 years old, but now discontinued. We were never given an instruction manual when it was fitted, and are hoping it may be possible to resolve this. Does anyone have a copy? Or do you know whether this model has a reset button / function on it? Thanks