I replaced the hot and cold valve stems on a shower installed in the early 60s.
I bought Danco 11k-3h/c replacement stems after matching old with new at the hardware store. They went in fine, but the valves fail to seat either off or on and and water runs continously.
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If your having major issues, I would try to locate the main on/off valves at your water heater and pump/cold water line in the basement. One the water is shut off, I would try to check if there is a proper seal...as required concerning the stem. It's probably on of the old gaskets that was not remove and doubled up. Happened to me. Good luck!
your video doesn't show much of your shower for very long, but at a guess i'd say you have separate hot cold taps, in which case always turn on hot first then carefully turn on cold to ensure there's no issue with water pressure. if there no hot water running at all the hot water valve is faulty
It sounds like your talking about the valves under the the lav faucet like from the pic that is showen in your post. But you used the word "SHOWER HOT AND COLD" So I am going with the idea that you are talking about a shower valve.
If your talking about the screw driver stops to each side if it is leaking from the around the center of the screw stop. You may just need to tighten the nut on the outside that the stem goes though.Or you can take the nut off (tirn off the water to the building) and get some rope packing and run a couple of rapps around the stem replace the nut and tighen and turn the water back on.
If it still leaks some to the samething over again just put more packing in. Should cost you about 5 dollars
Providing you have hot water everywhere else except shower, you have a bad mixing valve. Turn water off to your shower. You can pop out center piece of your plastic handle then remove screw and the rest of handle. There is a kind of c-clip that goes through the brass stem, through a slot in the side, you will need to remove, it might help to push in on mixing valve stem. When the c-clip is removed, the mixing valve should pull out from the brass stem. Depending on whether original install, if grease was used, it should pull out with some twisting and prying.Note how it comes out because you will want to put new one in same way. Sometimes these can be a real pain to get out, I have never broken one but, they can be tough and you don't want to break your lines. After old one is out, do the best you can to clean out inside valve. Make sure you apply grease to new valve. If water is backwards after install of new valve, hot on right, remove valve and turn 180 deg and re-install.
One of two things has happened. I'm assuming you only get hot water when you open the valve and that this is for a single handle control shower fixture. If so either this is the wrong valve for your shower control or it is installed backwards. Sometimes the valve can be installed at either 180 degree angles. See if it can be installed any other way. If so this may solve the problem.
#1 THE FAT PART OF YOUR SPRING GOES INSIDE THE FAUCET ,AND SIT ON THE VALVE BODY(SEAT)
#2 THE LITTLE BLACK WASHER SIT ON TOP OF YOUR SPRING #3 PUSH THE STEMS IN THE CORRECT SIDES HOT ON LEFT.CAUTION THERE IS USUALLY NOTCHES ON THE SIDES OF THE STEMS TO HELP YOU ALIGN THEM IN THE VALVE BODY, 4 PUT THE NUT BACK ON ,TIGHEN SLIGHTLY,TURN ON THE WATER TO CHECK ,IF OK RE INSTALL YOUE HANDLES
Thae stem you got that said hot/cold were designed to fit old style cross handle faucets. So both hot and cold turned the same way. If the cold side you are replacing turns the opposite direction then you will need to get a cold stem. Danco does make them. Ask the retailer where you purchased the H/C stem. I hope this helps..
Shower valves that have anti-scald features are renowned for this problem. Usually it is caused by not being used regularly. It can be repaired usually without replacing the valve, but you will have to dissemble it, clean, and use some plumbers grease to reassemble it. It should work fine after this. If it still does not work you will need to replace the cartridge.