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Can I effective remove sludge from radiators without a power flush? Power flushes are expensive so could i remove the sludge by taking off the radiator and the put a hose pipe through it flush out the sludge?

Hi, I have a not so old valliant ecoTech831 combination boiler and every time i use cold water the boiler fan turns on for about 30 seconds. Is this normal? Also when the heating is on and there is a demand for hot water the heating turns off which means if someone takes a long shower the...