Leaking cartridge
First to make sure they haven't fallen out as you push the cartridge back but the more usual problem is one of the original seals to be left in place and when the new cartridge is offered up it squeezes into place with the new seal which means it won't seal peoperly.
We have a video about fitting this cartridge (See Below) these seals are mentioned at about 2:30 into the video.
www.youtube.com/watch?v=bvng57EMQCI
Hope this helps.
Answered 6 years ago by George Thomson
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Mira Excel/Select Thermostatic Cartridge Assembly - 903.33
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