Thank you for your question, JoAnn! I do apologize that you are not getting warm water, but will be more than happy to help! If the RP47201 valve cartridge that this unit takes, is put in upside down, it can prevent the temperature from getting lukewarm. There is a H and C marking on the base of the cartridge along the black plastic. The H should generally be on the left and the C would be on the right. If you have a back to back installation, meaning hot water comes in on the right and cold water comes in on the left you would want to have the C facing the left and H facing the right.
Best Regards, Benjamin
Date published: 2019-09-23