Glow worm condensing boiler. Bled a radiator and the pressure went so low the central heating system and water did not work. Re-filled the heating system and thought I had filled to around 1.0 bar but without knowing it went up to 2.6 bar. Bled the system from one of the radiators and down again to around 1.2 bar. Central heating is still working but for some reason the water won't heat up and it doesn't sound as if the boiler is firing up to try and heat it either. Any help?