

Issue with a drain cap
Hey, I’ve run into an issue - my outdoor hot tub has a built-in automatic pop-up siphon drainage system with a cable (like in the picture). When you pull the knob toward you, the siphon cap rises (at the bottom of the tub) and drains the water. The problem is that while the hot tub is empty or has very little water, the lifting mechanism works fine, but if it's filled up for normal use, the siphon cap won't rise.
The hot tub was bought brand new and this problem has existed since day one. I just didn’t pay much attention to it at first.
I checked the cable and connections - everything seems to be in place. I also tried turning the screw on the lifting cap (to raise it higher), but no position solved the problem (and as soon as I raised it even slightly, it lost its seal and water began to leak out).
Has anyone encountered this before? Where should I look for the problem? Or should I just buy a new siphon part?