This question is regarding Mira Excel/Select Thermostatic Cartridge - 903.33

mira excel cartridge 903.33

replaced cartridge 2 years ago, just had a new boiler fitted (more pressure), shower head started to leak. Can i get away with just replacing the 'O' seal in the cartridge? cheers.
Asked 11 years ago by Anonymous

Thereshould be a red key that fits in to two holes at the back of thecartridge high and low stamped into the back of the cartridge using thekey you turn the back of the cartridge to high or low.

 

High for combi boilers and pumps over 2 bar

Low for gravity systems and pumps under 2 bar

But if this does not work it is a new cartridge I `m afraid as these are non serviceable.

Answered 11 years ago by Anonymous

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