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Many thanks for the replies and the comments. On further investigation I found that the ballcock on the expansion tank in the loft had stuck closed & the water in the tank over a long period had evaporated away. So the system was being starved of water!! After getting things going again...

My old Potterton bolier seems to be working OK on heating, but it does not seem to be heating the hot water tank. Feeling the pipes to the hot water tank, they get hot for a short distance, but no further. The same thing occurs whether the system is set for hot water only or for...