My pool pilot sc 36 is giving me the check flow warning. I have checked all flow/filters etc. and everything seems fine. The readouts show I have 0V but 6.5 amps and it shows that I have 0 salt in my system which is not right as my salt level is at 3200. Autopilot is telling me I need a new circuit board which is lots of money for 3 year old system. Anyone know why it won't read salt, has 0 volts, but Amps seem OK