I have an Aquatrite chlorine generator. It has stopped reading the salt level,shows zero and zero on the instant reading also. the salt level tested with a salt strip is just over 3000 PPM. When I turn the unit on and check the voltage it shows 29.2 volts and .13 amps when it comes on. This lasts for about a minute then the low salt light comes on and the generating light goes out. I expect this means I have an issue with the circuit board ?? Any Ideas for me to fix the problem.