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It only occurs when the heating is on. I do have the valves with the big numbers on as you put it on all apart from 1 rad. I do see the gauge going up for the pressure when i top it up. Thanks for you help, I am away for the weekend so cannot try what you have suggested. In the past...

I moved into a new build in Sept 2007 and ever since I have had problems with my boiler. It makes a banging sound then an error message of L9 appears, I reset the boiler and I get alternating 0 and 3 dashed lines and the boiler is roaring like a jet plane (error code is not in the manual)...