Lack of fine temperature adjustment

I have a Shower Doctor supplied (Dec 2015) Aqualisa Multipoint pink combi boiler cartridge fitted to Aqualisa Aquavalve 609 thermostatic shower supplied by hot water from a combi boiler and mains cold water. It worked ok when the cartridge was fitted (pumped supply changed to combi). The fine adjustment of temperature is now very poor - slight movement either side of an ok setting goes either too cold or too hot. The temperature change is almost instantaneous - this means it's not the boiler issue posted in an earlier reply to the same question. Are there any solutions other than another replacement?
Asked 6 years ago by Michael
It would appear that another replacement maybe needed , give the description you have given.

Answered 6 years ago by Barrie Seabright

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