Our shower doesn't get hot enough even with the knob turned all the way, I measure about 90 degrees F. A sink faucet in the same room at the same time shows 115 degrees F. The hot water pipe leading into the mixer assembly is too hot to touch, so it seems that enough hot water is getting all the way to the shower.
From reading other questions here it seems that these shower mixer assemblies usually have some kind of limit/adjustment mechanism, however I can't find it in this one, and it appears that the manufacturer went out of business a few years ago so I'm unable to find anything online about this particular brand (“Coventry Brass Works Limited”).
Does this particular assembly look familiar to anyone and is there a way to adjust it?
Here are some photos:
Temperature measured at shower
Temperature measured at faucet
Shower assembly
Shower assembly close up with handle removed
Shower assembly handle
Best Answer
If I am interpreting the pictures correctly, I think the white plastic piece that sits inside is the limiter. Carefully remove the U-shaped locking piece, taking care not to damage the piece slide the white piece out some and turn it counter clockwise slightly and re-set it.
Lock it back in place, and test the water max temperature again.