If there is a pressure balancing unit (minimizes the impact of reduced
flow to prevent fluctuations in temp) it may not be moving, and may need
replacing.
-g

dgd077 wrote:
We have a shower with a single handle. Hot water only trickles out of the
faucet or shower head, but cold water works fine. Any suggestions as to
what could be wrong. We get hot water everywhere else in the house.