My parents had a shower stall installed in their bathroom and had the
tub removed. And when you turn on the shower no matter which way you move
the handle the water is always cold. The shower faucet has a single handle.
Now my question is how can they get hot water in addition to cold.
Double-check the shutoff valves. Look for access panels in the wall
behind the shower and work your way to the basement. You can narrow
your search by determining if the sink by the shower has hot water.
I agree with Edwin, the installer is going to be the person that can best
fix this problem. It may be simple like the installer forgot to open the
hot water valve leading to the shower. Or it might be a symptom of a
bigger problem like maybe the water heater? Do you have hot water in other
areas of the house?
Safe to say that the cartridge needs attention. In a single handle pressure
balanced faucet, the water should not run at all if pressure to either the
hot or cold is lost so I think the regulator is stuck from debris.
Remove the handle and then the cartridge. Turn on the hot and cold water
supply briefly to flush the new popes into the shower stall. Rinse and
inspect the cartridge and replace. If that does not do it, call the
manufacturer of the faucet and get a new cartridge under warranty.
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