On Wednesday, September 19, 2012 1:29:57 PM UTC-4, Andy wrote:
After a new shower faucet was installed in the master bedroom, the second shower now has only hot water for a minute or two and then it is lukewarm. The second shower is a Glacier Bay single handle shower. The sink faucets in the second bathroom don't run out of hot water after a few minutes. Can someone please help me. Thanks, Andy

Is the second shower the one in the master bedroom where you just installed the new single handle unit? Or is the second shower a separate shower which went bad after you replaced the faucet in the master bedroom shower?

If it's the first case where the just replaced unit is bad, my guess would be that there's something defective in the single handle shower. Some spring or valve or sediment in the inner workings gets shifted after a minute or two of use and obstructs the flow of the hot water.

If it's the second case, maybe the replacement dislodged sediment in the pipes that found its way to the second shower handle.

Paul