Hi, I wonder if anyone can advise or if I need to contact the manufacturer about this? I recently had a new boiler installed and had numerous problems relating to boiler noise etc. some of which have been ironed out abit but some still remain. It transpires that the installer did not power flush the system and flushed using a system clean and an inhibitor. I have been advised that this may be contrary to the manufacturers instructions and I need to find out if he should have power flushed and if he has contravened the instructions if he has not. He signed the log book to say that he had flushed and cleaned in accordance with BS7593 and the boiler manufacturers instructions. As I have had such alot of trouble , stress and expense because of the problems with this new boiler, if it turns out that he indeed should have power flushed it then I am quite willing to take the matter further. do I need to contact the manufacturer about this, as I believe that if it turns out that he did not install correctly, it may invalidate my warranty. Grateful for any advice. Cheers.