Temperature control problem even after changing the cartridge

The shower (SIRRUS 1850-1) was running very hot and rather unresponsive to temperature changes. So I just fitted a new cartridge with the original thermo-couple and now it is running completely cold. I am unable to get it beyond lukewarm. Any ideas? Please help.
Asked 6 years ago by Sisira
www.youtube.com/watch?v=bQnHGckfW-g

The above video should help.

Answered 6 years ago by Barrie Seabright

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