We have an older type Baxi Solo boiler & suddenly the boiler will not ignite & the ignition button is not solving the problem either. As our flats are being renovated on the outside there are plumbers, roofers & builders constantly working. The problem with the boiler has happened coincidently with plumbers & roofers removing the roof & a lot of debris falling. Could debris have got into the square flu & be the cause of the boiler not igniting.