Is there any way that my new Price Phister bathtub faucet can be preventing hot water flow to that faucet? It’s brand new copper piping in a new addition. The plumber assures me that the pipes are fine and blames the faucet. Both vanity-sink faucet and bathtub are fed by the same hot water pipe, and the vanity is fine. PPhister gave me a new cartridge to try but were confident that it must be the pipes. Any ideas?