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In answer to these questions - "try looking in the pipework at the boiler, I've had several of these boilers getting blocked at the iso valves. Mick." What is an iso valve? "run c/heating and shut off rads that are working.if ok open same rads but only 50 percent" Tried this and...

Thanks for a quick reply Tony, The question is, what else do i do, or what do i need to check. How do i clear a blockage, is there a sequence/procedure to follow. All upstairs are really hot and downstairs are stone cold. Thanks Richard

Hi, I have a Worcester Bosch Gas Combi (24Si?) that is 6 or 7 years old. I turned on the central heating and the rads downstairs wouldn't heat up. I joined the NPower CH scheme, a guy came to do a service, but we wont be covered untill its working. He said possibly pump or dirt in the pipes...