We have changed the two pleated filters with new ones, but the flashing error code continues. We have drained and checked the exteriors of the foot well filters. The spa heats, the pumps work, all of the jets move water and the diverters are open so as to allow all of the jets to receive water. We did have FLO code flashing as well, but that has stopped after restarting spa.
How can we determine what the problem is and how to fix it.