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Good morning all, My mother had a new Potterton Suprima 30L Boiler fitted about 3 months ago and has had constant problems with it. Thankfully most have been sorted but one fault remains which the installers seem incapable of curing. The problem is as follows: When the system comes on in the...

my central heating system has recently begun to hammer loudly when the boiler switches off. this only happens when all radiators are off i.e heating water only. if one or more radiators on everythings fine.(boiler is potterton suprima 30L) anyone shed any light please? I should add that I have...