Jandy JXI400N Heater not displaying

Is the heater controlled by automation?

See if the Troubleshooting on page 24 helps — https://www.doheny.com/media/Pdfs/7609-instructions.pdf

Could be a bad User Interface board.
I'm not sure what you mean by automation. I'm using the two wire setup. The unit is only 4 years old. The lights come on but the display does not show anything and it does not fire up. Do you think it's still in the warranty?
 
Two wire setup connected to what?

Put in a warranty claim and see what Jandy says.
 
Have you opened up the heater and checked that the wires to the User Interface are not loose?
 
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