I have seen many posts regarding this boiler but non so far quite matching my issue. The central heating is working fine, HW on or off. However the On demand light does not come on when water is drawn from a tap, we seem to be able to get occasional hot water from the reservoir. This problem has happened since the water board did an unannounced repair to the mains on Friday and cut the supply without us knowing. I have also noted a lot of variation in the pressure and seem to be constantly adding water then the next minute using the release valve as pressure is too high! I also noticed it moved greatly when the boiler fired. Any ideas??
