Recently I have notice my combine is in problem, whenever I put the heating on, when I turn the hot water tap upstairs to have a shower, my combine will be in faulty mode, what that mean is the unit is in fault. I normally switch the main switch on and off, this will resolve the problem. However it did not do it last night, the heating was never on, but whenever i turn the hot water on, combine is turn into faulty mode. Help, no hot water , I feel cold 

