Hello, Could any one help please.......I tried to help my landlady fix her boiler.....It stopped firing and the no flame light flashes......I fitted a new ignitor electrode which briefly worked and then stopped working......then I realized the pressure was too high....I released the pressure down to about 1 bar ( manual recommends between 0.5-1.5) and the boiler worked fine for a day or so and then the same again....I am an experienced Electrician so if a component can be replaced then fine but any more then will have to seek professional help.....Any advice will be greatly appreciated. The boiler is a baxi potterton 105 he I think......4 years old.