Hi, our Baxi combi 80 HE plus boiler keeps stopping and having to be reset. Now its got the red flame light flashing and the green on light flashing and wont work at all. Before we get a boiler person out does anyone know what might be causing this so we know what to expect? We just bought the house and dont have any previous service history but think the boiler is around 5 years old. Any advice appreciated - many thanks