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Thanks to Corgiman and Shaggy for help re de-scaling system. (Sat 18th Sept post) Spent all day this Sat draining and flushing system - adding Fernox (limbo-ing under the rafters in loft!), bleeding radiators, and now I have hot water and heating!! Next Sat I'll flush and refill 3 times and...

My boiler shuts down after a few seconds (like a previous question). I looked on the 'how to' section and read that to stop the banging noises from the boiler and pipes I should descale. Should I use something like Fernox and should it be put into the expansion tank in the loft? Help please as...