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It suggests a short \ pcb failure on the balboa management interface or in the display itself.
Have you checked the ribbon cable going from the display?
The most likely fault is a faulty management system, you cant really get replacement PCB'd for them they are now sold as modules you just swap out.
You can check with a multi meter your getting power to the PCB, after than your looking at replacing the PCB if there is no sign of life to the spa, if there is and its just the LCD which is dead, then it points towards the LCD display being faulty.
Good afternoon John,
Just wanted to follow up to see if you needed anything else, and ask if you could please log back in to Just Answer and rate the service received using the star rating on the question page so I may resolve the case.