The red flow light is on and there are blinking red and green salt lights. We’ve had the water tested several times. All is good except chlorine level and we are adding shock. Our pool people came out and replaced the flow switch. Went from a 4 wire to a 3 wire. Didn’t fix it. We bought a brand new cell IC40 because 2 different pool companies said it was the cell. We plugged it in this morning and the problem is still there! Flow is good and strong into the pool. When I did the test in the old cell the green cell light came on and showed 40%. When we put the new cell in and did the test the green cell light came on but no percentage lights lit up? Please help. We have lots of money invested and no fix.