How can I remove this thermostatic mixing shower faceplate?

Question

This shower has a temperature selection knob, which operates separately from the water pressure/on-off knob.  The selection is unresponsive, water temperature does not rise or fall when the knob is twisted.

I thought I'd start by taking the faceplate off and learning more, possibly replacing a cartridge.  But pulling off the faceplate is blocked by the black ridged ring on the knob:

I see no indication of the manufacturer or model of this shower.  Any advice for how to proceed?  This is what it looks like behind the knob, peeking behind the faceplate when it's slid out as far as I can:

It seems like I might be able to address the problem there.  But with the faceplate on, I can't access those parts.  Other detail in case relevant: this temperature selector knob controls three shower heads, two of which share one on-off knob and the third on a separate on-off.

HoneyDo · Accepted Answer

I believe that chrome cap on the front of the knob needs to be removed. The valve I have is similar. Look all around the temp control knob for an inset set screw that takes a small allen wrench to remove. The other possible option is the chrome cap needs to be carefully pried off. In either case I think you'll find the key to removal of the knob is on the knob somewhere not behind the escutcheon.

Correct answer by HoneyDo on August 13, 2021

How can I remove this thermostatic mixing shower faceplate?

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