Cold crossing to hot inside shower

I have an issue with the shower letting cold across to the hot side, would this be this part that has failed, I notice this shower valve has not got any non return valves on the inlet arms??
Asked 9 years ago by Anonymous
This valve only allows mixed water to flow to the shower head, so will not be responsible for this problem. 
I believe that the non return valves are beneath the nuts on the fron of the valve.

Answered 9 years ago by Anonymous

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