Mira 915 won't turn off

My Mira 915 is probably about 23 yrs old. The flow knob has been sticking when opened fully. Up until now I have managed to turn it with a little extra effort. It has now stuck completely in the fully on position and won't budge. Have isolation valves so I have turned it off with those.
Asked 6 years ago by Paul
www.showerdoc.com/mira-cartridge-assembly-f-c-915-902-85

www.showerdoc.com/mira-915-flow-service-pack-935-02

You could try the service kit to see if that helps, or fit a new cartridge.

Answered 6 years ago by Barrie Seabright

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