Perhaps someone can help me with my gas fired baxi bahama 100 combi boiler. The boiler runs a total of 10 rads, thats 6 downstairs and 4 upstairs, the upstairs are 2 at the rear of the property and 2 at the front, this happened the same time last year as now. I have been running the system on 9 rads leaving of the big rad in the front bedroom off. now I want it on it works but both the rads to the rear of the house have gone off. I have checked the system pressure and this is fine, any ideas before I try to find a man who can if he's not to busy that is.