First time poster here and I'm just starting the learning process about my new pool. Recently when switching to SPA mode, the water does not heat up to the desired temperature and instead it slowly gets luke warm. I also notice that water over flows the spa and into the pool. This leads me to believe that the valve is not working properly and is pulling water from the pool, sending it through the heater, and returning it into the spa. This would cause the water to only be luke warm since it's not isolating the spa water like it should. The heater seems to be working perfectly fine. FYI I have a pentair easy touch system.
Can someone give me some pointers on where to start diagnosing?