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New Mira Excel cartridge temperature range

This question is regarding Mira Excel (1990-96) Cartridge - 903.33

Hi I recently fitted one of your replacement Mira Excel B pre-2003 compatable cartridge to replace the faulty old high pressure one. I now find that the temperature adjustment is very sensitive, changing from cold to hot with very little movement of the knob. The new instructions made some mention of refering to the original ones to set the temperature range but these have long since vanished. Any suggestions as to how to fix it?

many thanks.

Asked 8 years ago by Anonymous
This is unlikely to be caused by the temperature range adjustment being wrong but is more likely to be a supply problem.
If your shower is fed from a combi boiler or an unvented hot water cylinder then it is possible that the cold water supply pressure is too high for the hot and a pressure reducing valve in the cold supply to the shower is required.
It is actually more likely that the shower is reverse plumbed and hot and cold supplies are swapped. Industry standard is hot to left and cold to right.
If your unit is reverse plumbed it is easily corrected, just remove cartridge turn through 180degrees and refit. Fit the knobs right way up and thats it.
Temp range adjustment is simply done by removing temp knob and turning hub until required mid range temp is achieved removing hub without turning spindle and refit in vertical position, may take several attempts to achieve desiresd temperature.
Answered 8 years ago by Anonymous
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