Been tackling a boiler issue for several months now but with still no success. Boiler has 5 heaters with mircobore pipes. During start-up of the boiler, the boiler makes some loud grinding / 'tin' noises on and off for about the first 10 - 15 mins. I've had a few companies out but the problem is still there. We've flushed the system, changed the pump. Another company said it was the mircobore which was causing the problem and bigger pipes were to be fitted. No companies have said it was the boiler that was faulty. Any advice would be great.
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