Pool and Spa
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You might need another Jandy PDA to try out on your Jandy spa equipment. Has the PDA been gotten wet, dropped onto a hard surface, or is it several years old? then it may simply have 'died' as far as communications ability is concerned.
But first, try removing the battery from the PDA for overnight. See if it works at all, for controlling the spa remotely, or at least responds to Learn Mode, after that.
Then the receiver in the Jandy spa must be defective somehow.
Have you gone through its setup again, as if it were just newly installed? if not, I suggest doing that.