I have a new Hayward heater. I keep getting a lo code when the pool is turned off. This is a brand new heater and pool. My pool company that installed the pool told me to make sure I’m getting proper water flow in the system. But didn’t tell me how to do this. Do I do it on the Hayward screen or on the pool pipes. I’m new to this. They were no help. I would like to figure this out on my own so they will not charge me. So if anyone can help I appreciate it. Pool and sand less filters are very clean.