Been running the salt a little high for about 2 months now. 3900ppm.As the water went down I noticed the level went to 4200 then the general fault.I added water then noticed a general fault and it said 25500ppm.Would this be caused by the salt level or is my 7 year old sensor bad?It is a jandy 1400 system.The generator is new but the sensor is not.How do I check the codes in the panel? Are their some buttons I need to hold down to get the code?