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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.
either to much water pressure to unit or pull up is clogging /damaged if u have separate valves on water supply start at half way and work ur way open or close till water doesnt come out of shower head
probable that there is mineral deposit's,scale buildup,inside. pull cartridge and look in valve body,turn water on to it and flush valve body real good.possible model #1222-if it's posi temp ,#1225 for reg faucet
The valve is installed upside down and needs to be reversed. There is a diverter in the valve that gives the spout priority. When the valve is upside down it gives the shower head priority. Thats why it runs without the diverter being activated. You will need to get in the wall from one side or the other. Cut the valve out and either flip the faucet Or change the direction of the diverter depending on the style of valve.