Various cracking banging noises bit like shot guns out of the blue. I have had various visits but still making massive cracking noises. I have been given different reasons for these cracking and banging noises. Different engineers called making different adjustments. At the moment I have turned them off. It saves jumping out of my skin wnen all of a sudden a cracking bang. Five years guarantee against what? I am fed up of making appointments for engineers to call and make adjustments to radiators that obviously are not adjustable. When winter comes I will be sat here waiting for this loud crackingh noise. Or put a blanket on.