Hi Chaps,
To answer all your questions and respond to advice and statements made:
Agile: I dont disagree that x300 does what you say (removes flux residue) however I was never taught to use it as part of the commissioning process and have always seen it as an option rather than necessity. With regards to the water quality, I haven't done a lab test on it but when I drained down to remove the initial leaking rads it looked as you'd expect. I have been to the property numerous times since commissioning and have not witnessed the system pumping over. Although you say my task is to prove that what caused the rads to leak is not my fault, would it not be fair to say that it is the task of Stelrad or the customer to prove that it is my fault. Unfortunately I have to disagree with your statement that excess flux would hole the rads in a few weeks, I just dont think that would be the case. The inhibitor I used was sentinel and I didnt put a sticker on the boiler as we didnt replace the boiler, regardless, I dont think putting a sticker on a boiler would necessarily constitute proof of adding it to the system anyway. Finally, the builder is very thorough and certainly didnt try to get away with a cheap job, He didnt give me a specification detailing chemicals/commission etc but then what builder does?
Ironman 1: I think you may be right about air entrapment, however the pump, cold feed and vent are all installed in the correct manor and as previously stated I have not witnessed any pumping over.
The owner will not go down the route of suing Stelrad as their contract was with the builder. Do you guys think that its down to me to prove that it wasnt my fault or for another party (customer/builder/Stelrad) to prove it was my fault?