I'm having a problem with a customers pool I can't quite figure out. It's a basic pool spa combo with salt and a heat pump.
The return actuator was having problems so I replaced it. Customer reports a few days later that when in spa mode water is returning back into the pool and dropping the spa level about an inch every few minutes.
I checked the actuator and it's set properly (Hayward). I replaced the guts of the valve and figured I was done. Problem is still occurring.
I replaced the valve body. The valve and actuator are now new. Same problem exists but now it is intermittent. It worked fine 3 times then it was losing water back into the pool again. I can feel a small amount coming out of the return. I've examined the valve and the valve looks fine. The whole valve is brand new.
I'm stumped. The only thing I can think of is the actuator has an issue where it does not fully complete the turn. But I have seen the problem occurring when the actuator looks like it turned fine. How could the valve not seal properly? Valve is Pentair btw.
Any help appreciated and the forum here is great btw.