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Get yourself a large diameter cylinder 10 metres long. Stand it on end and fill it with water. If you measure the pressure at the top just under the water level it will be nothing (nothing above atmospheric pressure) Go to the bottom and the pressure will be one bar above atmospheric. Now...

Problem solved. I don't know how unusual this has been but it might help someone in future. The X400 wasn't getting anywhere. I tried flushing the feed circuit to the upstairs radiators by taking off the TRV at a radiator and putting a hose on with a compression fitting. I found a compression...

John - Following your suggestions, thank you again. I have shut off all the downstairs rads at the TRVs. At the boiler the outgoing HW feed and CH feed are too hot to touch. The return CH pipes are cold. The ingoing pipe to the pump is too hot to touch so I assume that most flow is going...

John, Thank you very much for these helpful suggestions, as soon as I can face the loft temperature I'll try them out. An additional question please if you can help. Is it possible that the upstairs heating circuit has fungal growth that is stopping the circulation? I've already added 2...

One thing I forgot to mention. When I started looking at the problem I found some thin jelly like stuff floating in the F&E tank. It would disolve if I rubbed it between my fingers. Before I started flushing I washed it away down the overflow pipe. The F&E tank has a close fitting cover as well...

Help please, my upstairs radiators won't warm up The boiler is a cast iron Potterton, more than 20 years old. There are three twin pipe CH circuits, one upstairs, one original downstairs and one "new" downstairs circuit added more than ten years ago. The hot water is a gravity cicuit. Both...