Hi all, I'm a newbie on this site but found some useful info on here in the past. Anyway, I've installed a showerlux hydrozone spa bath that has water jets and air jets. It all works fine, but the problem is, when the bath has been finished with and emptied, after about five/ten minutes the air jets opperate on their own, with no water in the bath, and no buttons have been pressed? I've looked and looked for manufacturers fault finding but can't find anything. It's all plumbed in correctly, it's on it's own 2.5mm feed from the box and has its own trip switch located outside the bathroom. Anyone ever come across this fault before? Or is this normal? Indeed if it is a fault rather than some sort of cleaning cycle?