My Jandy Legacy heater is not working, and the display shows "Fault - Shorted H2O Sensor" and "Water:212o Set:104o". I understand that means that the temperature sensor is bad and needs replacing. It's a salt pool and the manual lists two parts: R0477300 (salt) and R0456500 (regular). I tried to find the the salt part online and several sites said it had been discontinued and replaced by the regular part. Is this true and is there really a difference? Also, can someone point me to instructions or a video on how to test to see if it's really the sensor and how to perform the replacement? I have a multimeter but have no idea where to start! Thanks.