I would try calling Jandy first. Be ready to be on hold a long time!!! The flow sensor most likely is failing. They know about the problem with them. The new flow sensor (Tri-Sensor) comes with a Tri-Sensor Adapter that plugs into the front board, then the sensor cable plugs into that. The adapter board has a calibration button on it. After you install it, let it run for at least 4 minutes and then hold the little calibration button for 5 seconds until the flow light lights up.