You have a broken or missing stop or handle. Here is a parts break down. Remove your handle and see if any are missing or broken.
I have 3 Moen showers/bathtubs in my house that I believe are Posi-Temp. There is a single handle, when off it points downwards at 6 o'clock. 9 o'clock is hot, 3 o'clock is cold.
My house is 11 years old and I'm the original owner and all these faucets work fine, with no leaks, no temperature problems.
However they spin 360 degrees without anything to stop them. I am selling my house and was told by the buyer's inspector that the faucets are faulty since they do not have "stoppers" and can spin 360.
For the life of me I can not recall any of these ever not rotating 360, but I can't say it's something I've paid much attention to.
Is it correct that all Moen posi-temps have stoppers and thus I likely need a new cartridge? Or are there various models that spin 360 as part of their design?
Thanks from a confused homeowner.