My husband in stalled in shower vavle body. When bathtub is filling, water comes out shower head any ideas.

I think that the switch that lets you change the water to come out of the shower head and the bathtubs water spout is broken and needs to be replaced. Or it could be stuck then and needs to be unstuck.Have a plumber take a look at the water taps switch part then to see if it needs replacement or needs to be unstuck.

that is up to you
but consider this
Age or physical problems makes baths difficult and dangerous
so a shower stall with a seat is a better properisition
next showering last for around 7 minutes and that amount of water is less than 1/2 tub unless you stand under the shower until the hot water runs out
lastly , I have never considered it hygienic to wash you face in the same water that you wash your rear in

Be sure to pull the plunger all the way up when diverting the water between the the tub and shower if ti keeps giving you a problem it's faulty

You can buy an adapter for raising or lowering your head. it will attach to the pipe coming out of the wall,and then the head and is roughly an "s" shape. any hardware store will have it

when the water diverter is used it leaks, the problem is the pipe that runs up to the shower head is either rusted trough , not connected or not even there. You will need to cut an access panel in the back of the wall and inspect the plumbing, unless there is one already there. I am guessing that even if you replace everything it should not be more the $100. The cheapest place to purchase your items would be on eBay, of course if you can't wait Wal-Mart carriers what you need. Good Luck Tim

if the water pressure is high all thru the house then turn down the valve on water main or or if well adjust cut in -cut out or valve down a bit if just high at tubs can adjust valves on water line can install a water saver behind shower head or if u have access to the valve body in wall there are adjustments on both sides where the water lines come into -----if this is about temp in ur paperwork advises how to adjust the anti-scold --remove handle and trim will see a blue and red plastic clip on valve stem adjust till temp is comfortable

Check water lines to shower and make sure that there is no blockage or water cut off to it. Valve itself could be bad also or blockage inside it.

I f it is a tub & shower unit the diverter may be bad or stuck in place restricting water flow. Some are push button on the valve or a pull unit on tub spout to send water to shower head.
Cut water off and remove to inspect for reason not functioning correctly.
Remove shower head to inspect for blockage. The srceen may be stopped up for the shower head. Remove turn water on and see if any flow comes out shower arm.

Not unless you had a backward plumber , If the diverter at the faucet is open for tub, then no water will go up the shower, The shower may hold enough water up there to make it look like a drip, Even if the valve was leaking all the time, it would not go up, it would come out the faucet. It only works with pressure. Unless the valve was plumbed wrong,,, Hope this helps.

552.54 Luminaires.
((B) Shower Luminaires. If a luminaire is provided over a bathtub or in a shower stall, it shall be of the enclosed and gasketed type and listed for the type of installation, and it shall be ground-fault circuit-interrupter protected.
The switch for shower luminaires and exhaust fans, located over a tub or in a shower stall, shall be located outside the tub or shower space.

Essentially there is no distance specified BUT the fixture must be sealed AND protected with a GFCI

the washer on back of the dirverter knob needs replacing or the seat behind the vavle stem