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thanks for reply and sorry should have said the boiler has a timer switch so we can have heating and water or water on its own the hot water when heating and water on together is extremly hot and so is one rad when others off and so to with one rad at a time

Many thanks for your speedy reply, i have tried all or most of the solutions first of all when i switch the heating on from cold it only heats a few rads upstairs and then goes cold if i go round each rad that is getting hot and switch them of the heat moves on to the next and so on till one by...

Hi i was wondering if anyone could help me, i have an old back boiler that still works fine it is a open vented system with the tank in the loft, the water is set at correct leval when cold, i have a problem getting the rads to work tried a new pump had the rads off about 5 times hit them and...