Through online searches this stands for Low Pressure but sounds like it can be caused by a bunch of stuff other than just a freon leak, like a bad fan motor, start capacitor, control board, etc., etc. Since I don't have A/C gauges, would like to try to cross off anything I can before calling a repair person. I was hoping perhaps someone could give me some pointers on where to start and how to test things if possible. I know on my house heat pump I could try to start fan capacitor by spinning the fan at start up, but my pool heat pump does not start up for a few minutes, so not sure when/how to test that. The model is a Hayward HeatPro HP11002. Any help is greatly appreciated!