If I am reading this right. You have one single handle that controls the temp and flow in your shower, correct? This being the case and you cannot adjust the HOT down enough with the handle. Then my suggestion would be to turn it down at the water heater. If you remove the access door on the side of the unit. There should be either a dial you can turn with a small flathead screwdriver. Or a switch that selects the desired temp. But take into consideration that this will effect ALL water temp throughout your house. Washing machine, Dishwasher, etc..................
There might be one other thing to investigate as well. Look into the cold water supply side at the water heater. It might not be open all the way. Thereby restricting the cold water flow..........:)
Good luck,
Jason
SOURCE: Not enough hot water
Some higher end models do have an adjustment that is behind the face plate. You would have to remove the handle and the screws in the faceplate to expose them. If you have adjustments they will be located on the brass valve body facing you. You will need a flashlight and a flathead screwdriver to make the adjustment. If your model is not equipped with adjustments you could have a faulty valve stem. The stem is comprised of a rubber band like gasket that separates port holes into which the waters flow. There could be some piece of trash blocking the port not allowing adequate water from the hot side into the valve.Some valves stems are also able to be installed upside down causing the same issue as the ports do not rotate fully to allow adequate supply. However you say that you have adequate pressure on the hot side but not warm enough. There is another possibility also based on the way the shower supply was plumbed but there is no need to go into this unless this does not resolve your issue. I hope this is of assistance and thanks for using Fix Ya. Please let me know if I can be of further assistance.
SOURCE: Single handle Pioneer shower faucet
its the mixing slide in there its stuck u can take it apart at the handle it pulls out shake it if it doesnt move its bad. what happens is over time sediment gets in there and seazes it up. if you take it apart and its not stuck then its ur mixing valve on your boiler is bad good luck
SOURCE: Delta single handle faucet. Hot or cold no in between.
well they should be same size but unless you getting more of one then other then sound like mixing valve is not mixing. do have 3/4 hook up to mixing valve? you only need 1/2" to valve.
SOURCE: a single handle delta shower control lets water
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.
SOURCE: shower diverter push handle is squirting water out
If you are handy, the best solution is to call delta and have them send you a new diverter. They will need the model of your faucet. The new diverter will come with instructions on the install process. As far as fixing it without the new diverter, I don't believe you will be able to.
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