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The above certainly worked for me, try draining and refilling, if that doesn't work use a Cleanser. (Fernox DS-40 worked in my case).

Hopeful Fix...Same Boiler [/b This happened to me a couple of weeks after adding Fernox MB1 Central Heating Protector. If this was the cause, it was probably because I did not follow the instructions correctly. I wish now that I had cleaned out the header tank as advised, there was a brown...