Hi, just installed aqualisa colt consealed shower COLT001CA and the control unit on the wall constantly weeps water. Its brand new so hard to believe its the O ring on the cartridge. To me it looks like the seal between the cartridge and housing plate isn't sufficient enough. The large rubber seal that runs inside the cartridge (4 screw holes in seal) is almost lower than the plastic itself so when you tighten the screws the seal isn't made . Anyone come across this problem and how to resolve?