I have a Ferroli Optima 901 combi boiler which was working fine giving both hot water and heating. I bled a radiator yesterday and found this morning that I had no hot water or heating. I realised that the pressure had dropped to below the minimum of 1 bar and looked on the forum and found how to increase this. I have now increased the pressure to 1 bar but I still have no hot water or heating. Can anyone help? Thanks.