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Hi The overflow pipe,from the expansion tank,keeps dripping,but only when the central heating system is running. I know it might seem fairly obvious,but is it just a simple fault with the ballcock? Can it be adjusted, or does it need replacing? All help appreciated.

Hi Last year we had our hot/cold water tanks moved into the loft. Since then,we have been unable to have just hot water on when using the boiler as the radiators also get hot. The central heating is also,not responding to the room themostat,as it just keeps getting warmer and warmer. We have...