I install the facet and turn on the water a little over half way and the shower come on with the shower button pushed down. If turn the water less then half way the shower will not come on??

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I install the facet and turn on the water a little over half way and the shower come on with the shower button pushed down. If turn the water less then half way the shower will not come on??

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By turning down the water less then half way you reduced the pressure needed to force the water up the shower raiser. This is normal, Good luck, Tom