I put mine on and it was 79 degrees. Just a couple off. Would you say it is a bad boatd?To test the board get a 10K resistor and put it in place of the temperature sensor. It should read 76F. If it doesn't or drifts over time then you have a bad board.
Some members have had good experiences with BP Engineering, Inc. repairing their Jandy boards.
They can be contacted at bpengineering "at" sbcglobal "dot" net
Jandy Aqualink RS - Further Reading
www.troublefreepool.com
Temperature Sensors - Further Reading
www.troublefreepool.com