The boiler is a Worcester Bosch 28 CDi, about seven years old.
At installation I was told the pressure should be about 1 Bar when off and about 2 Bar when running.
I recently bled the radiators and re-pressured the boiler and now the pressure range seems too great:
0.5 Bar when off; 2.6 Bar when on.What needs to be done? What are possible causes?