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If the Bypass valve is only open 1/3 of a turn then it won't be that causing the problem. If the rads are hot at the top but cold at the bottom it suggests to me that they are not getting enough flow and the system is not balanced properly. After you have balanced the radiators which ones are...

Have you got a manual bypass valve fitted by the pump? If so check that it is not open too much. If you close it fully do the rads all get hot? It should be open a little, much better to just replace it with an automatic bypass valve. I thought our heating was poor for 3 years, had loads...

Since we have moved into our house last year the heating has never been anywhere near as warm as we would like. Firstly the boiler would constantly cut out so after reading about this on the internet we got the circuit board replaced with the latest revision. This fixed the problem of the...