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The 2nd BG engineer bleed one of the top radiators and when he closed the bleed valve the small amount of water that drained on the kitchen towel was dirty black. Is this enough for an engineer to say that it needs a powerflush?

Hi, Had BG over to fix my problem of no HW or CH. Thought it might be the dodgy PCB in the suprima, but turned out to be the circulation pump, which they replaced. Thought everything was ok, as boiler fired up and the CH started working again. However, noticed that there wasn't any hot water...