Behind shower valve handle and trim plate
If you mean shower valve, screws are for shower valve coverplate.
Cut out the drywall in the wall behind the shower. Replace the valve. Patch the drywall.
A leaking shower valve by installing a new cartridge.
The valve is not be diverting all the water. This valve may need to be replaced.
Shower valve is bad.ANS 2 - OR possibly the orifice in the shower valve is plugged with sediment or rust, -A very common problem. Can be cleaned out quite easily in most cases.
Your water pressure is low. Consequently, when cold water is diverted to another application such as a toilet or a sink, the amount of cold water available at the shower mixing valve decreases as the low pressure is unable to keep up with the shower's demand. This causes a hotter mixture at the shower head. The solution is to either improve the cold water supply to the shower or to replace the shower control valve with a temperature compensating type. Pressure balancing is the cheapest and simply changes the shower temperature according to the pressure in the cold and hot water lines. When the toilet or sink is used, reduced pressure to the shower valve is detected and the valve reduces the hot water pressure, thereby maintaining the temperature. The more sophisticated approach is a thermostatic shower control valve. These are significantly more expensive, but will not reduce the pressure at the shower head (a drawback of the pressure balancing valve). The thermostatic valve would be required when one shower control valve is operating several shower heads. Moen, Kohler and Delta all make both types of control valves. They can be readily obtained from a local plumbing supply house.
The valve in the shower control needs to be renewed.
Replace the shower valve.
On older modelsBehind the valve stem sleeve and escutcheon there is usually a packing gland nut which can be tightened with a valve stem socket wrench designed for the make and model of shower control your asking about..
The same height as the normal western shower valves, this is why they are yellow, they can't show because they can't reach the valve.
Though not a plumber, I can say that shower valves are usually made of brass(a very good material). Therefore they are also expensive to replace (50 dollars for the valve, 150 dollars per shower valve if done by a competent plumber). Therefore, when you notice a leak coming from your shower, try to replace the seat washer (usually the hot water side needs to be replaced first). If you still have a leak, it's time to replace the shower valve.
YES!