Mixet temperature control dial hard to move

[PNW21]

Last year, I had to replace my shower control handle (it is acrylic and it was cracked). I bought a Mixet temperature and volume control (see photo), since this is what was on there. So far, I only replaced the cracked control knob and have not replaced the existing temperature dial. However, I am finding it hard to move the temperature dial more than 1/4 inch from the middle position. I have a feeling that replacing the temperature dial will not fix this issue; there must be another reason that it's not moving very much in either direction. Any thoughts?

 

[Terry]

You might check this link below on Mixet.

https://terrylove.com/forums/index....r-valves-cartridge-handle-replacements.92747/

I looked at this the other day. A new trim and cartridge would have been nice.
I did replace their kitchen faucet for the rental unit.

 

[Sponsor]

 

[Mr tee]

People have a tendency to find a comfortable temperature and just leave the lever in one place. It wants to stay there by habit (corrosion etc.). The easiest solution is to change the. Cartridge.

 

[Jadnashua]

Sometimes, if you take the cartridge out and put some silicone plumber's grease on things, it can free it up again...it's a cheap thing to try, but a new cartridge may be necessary.