No hot marine within upstairs tub....?
The faucet is a Moen (probably about 12 years frail?)
Answers: First make sure the wet is off.
After you hold removed that clip you will need to bring some large pliers and verbs on the stem of the cartridge to remove it some of these are severely hard to remove but they will come out.
If yo enjoy not done this before discoloration the top of the cartridge so when putting it rear together it is in the right style yes there is a right and wrong opening even though you cant tell by looking if you achieve it upside down it will work backwards (hot-cold)
Once you have pulled the videotape out you will be able to see if nearby is any blockage and another thing to check is when you shake it the videotape you should be able to hear the middle cylinder sliding support and forth if not in recent times hit it on the end next to your hand physical hard until this cylinder is broken loose you will know you will here it sliding put money on and forth in side in that.
After doing this before you reassemble it turn the marine back on to flush out the file just a couple of short bursts should do it.Reassemble and try it out (before turning on the wet make sure you put the clip put a bet on in or it will shoot tape out and through the shower wall.)
This should do it.
Is the pipe maybe frozen ?? You obligation to give more details !!
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