I bought a used hot spot relay spa year 2012 or 2013. It sat empty for 2 weeks and when I finally filled it with water and turned it on it was vapor locked. I fixed this issue and noticed the pump would run on low even when the water temp was at the desired temp. Also notice a series of dashes on the control panel. I looked in the Manuel and this was a low flow code. These dashes also show on the control panel when it is on high jets speed. It does not do it all the time but very frequently. Like daily. Sometimes the motor will not shut off. If I cut off the power and restart the spa sometimes it will heat up and run normal for a short period of time. Then does this all over again. Could this be a pressure switch. The filter is clean. Repair man trying to sell me on replacing circuit board,heater,and control panel by United spas. I need some help fast.