When you pull the stem up, it diverts the water from the tub spout to the shower head. Somewhere between the valve connection and shower head arm, you have a leak. The easiest part to check would be the arm that comes out of the wall that you screw the shower head on to. It is normally screwed in to a "shower Ell" and that connection and or pipe is easy to crack if someone pulls on the shower head. Pull the escutcheon plate towards the shower head and try to see into the hole and look for water at the connection. It would only leak when you are using the shower. If it is another connection or the riser pipe itself, you'll have to access it through the wall, hopefully from a room on the opposite side of the wall. Good Luck
yes you are even though you are not in the shower you are still wasting water
means you are running out of hot water
Seats in the main valve body are leaking by, allowing water to go to the shower head.
By opening the walls
Remove the shower head and clean out anything that might be blocking it, such as hair or debris. Replace the shower head and turn on the water; the water should be running.
More "VOLUME" flowing from the tub spout then the shower head as the shower head has a flow restrictor
The valve is not be diverting all the water. This valve may need to be replaced.
Either you don't have the knob pulled all the way, or the disc in the spout is faulty.
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Remove the shower head and clean out anything that might be blocking it, such as hair or debris. Replace the shower head and turn on the water; the water should be running.
Not advisable ... water is a conductor of electricity, so if a lightening bolt makes contact with the water lines in a home or apartment, and a person is in the shower with the water running, they are apt to get fried.
When you take a shower, you're mixing a combination of hot and cold water to make a comfortable temperature for the shower water. A toilet draws only off the cold water system. In older or poorly designed plumbing systems, when you flush the toilet, the cold water is pulled by toilet, so the water coming through the shower is only drawing from the hot water tank.