Mira 903.33 cartridge Setting
Firsthave you set the cartridge to high pressure?
Ifthe cartridge is set properly then see below for how to adjust the temperature
Removethe temperature control knob then turn the purple butterfly to max hot.
Slackenthe screw in the centre of the butterfly (do not completely remove the screw) slackenit just enough to allow the butterfly to be pulled forward and clear of thesplines that it sits on, now turn the butterfly clockwise until it is at the6'O clock position retighten the screw fit the temperature knob and test theshower.
Youcan try this operation again and perhaps even a third time however by then itis usually beyond its maximum hot adjustment.
Answered 11 years ago by The Shower Doctor
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Mira Excel/Select Thermostatic Cartridge Assembly - 903.33
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