Trevi boost shower fixed head cartridge - Sterling Plumbing 1500D-31S VISTA PIVOT SHOWER DOOR

replace the faulty thermostat

If you cannot locate a remote control have a plumber command and we can figure the plumbing two valve so your body wash your rainshower every will work without remote is just a gimmick

no need to take it apart. soak it in white vinegar. buy a gallon, it's pretty cheap. give it a half of a day, it will be like new.

you need to remove the cartridge behind the handle. If it is dripping from the spout or shower head.
If you pull the handle to turn it on it is called a moentrol valve and take a number 1225 cartridge....it it just turns to turn on it is called a posi-temp valve and takes a 1222 cartridge.

Make sure the drip is continuous because the shower head will drip for a few minutes until it empties out. Replace the cartridge or washer kit if it keeps dripping.

the problem is in the shower fitting the part with the handle ,depends on who made it but you replace washers or a cartridge some times easy some times not

for some reason the cartridge set up does a sporadic drip which is infuriating but replacing the insert will not fix it
after the cartridge there is just an empty hose to the shower head and no pressure