I am going through a bathroom remodel and the contractor just left for the night. He placed a new valve in today but only to the point of testing the water so there is no cartridge. I just noticed now that the sink in the same bathroom has only cold water. The shower in the other bathroom has only cold water. The sink in the other bathroom and kitchen will get luke warm. Could this be because of cross connection since the hot and cold water are being allowed to mix in the valve since there is no cartridge in yet? Thanks in advance for any information.