I am hoping someone can help me. I replaced my dishwasher last week and since then do not have any water coming from any of my hot taps. I have a combi boiler which is working ok and there is water coming from the cold taps. I have tried the tricks for an air lock ie cold water to hot but have since read you shouldnt do that with a combi boiler. Can anyone help . I do have a valve that is turned off for the washing machine but it has been like that for the past couple of years so don't think its that.