The home I am living in now has two uptairs bathrooms and the water temperature is controlled by one knob. In the master the water will only come out hot and in the other, the water will only come out cold. For example in the master bath, when the water is turned on there seems to no water presure in the cold setting but as you turn it to the hot setting the presure increases and the water comes out only luke warm and hot. Vice versa for the other bathroom. The strange thing is that in the sinks of both bathrooms and everywere else in the house all the faucets are fine. The house has been unoccupied for two months. There is also a soft water system and a reverse osmosis system in the house. What could be causing this?