Intermatic Actuator for Pool

I just replaced one that kept getting water in it, it's mounted vertical to control my solar system, any ideas how water is getting in? If it happens again I'll test the water to see if it's pool or rain water...
it's condensation building up inside, when it's mounted vertical the wires on the bottom, so there is no where for water to drain, but mounted horizontally it will dry up do to larger surface...
 
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