Replaced cartridge, still temp problems

Hi all, Have just replaced the crosswater thermostatic cartridge due shower temp issues. Now I can make the shower run cold and back to like warm. If I turn on hot it runs really hot, as soon as I mix cold in then it will only ever return to luke warm. The other shower in the house is fine and we checked the boiler was ok to serve the shower, no problems. Could it be the non return valves?
Asked 6 years ago by Nick
Yes it could be sticking non return valves that are causing this problem.

Answered 6 years ago by Barrie Seabright

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