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Oops, thanks Dave for your smart comments which were really useful, how about giving me some advice as to what the problem could be with the RAVENHEAT RSF 820-20 boilers hot water system. Edna.

I have a ravenheat rsf 820 -20 combi boiler, the hot water was intermitent, called in an ex BG eng`, who replaced the diverter valve, worked for a short while, but not as it should, then a rumbling noise was heard , called eng` back who replaced the fan. All went well for a couple of days when...