The boiler is an Ideal mini c24, it was installed in 2006 and I'm unsure whether it has ever been serviced. It works fine for about 30 mins or so and then it locks out, when you press the reset button it attempts to ignite but fails. When it is left for a few hours it will start to work again but eventually lock out. The pressure bar is just above 1 cold and goes just passed 3 when warm. In diagnostics mode led 1 and 3 are flashing green and led 2 is solid red. Anyone please??