1) More information is needed.
Is this new installation? Or timer that worked before and stopped working? Add a comment with complete information.
2) There are no repairs for defect timer, other than to reset timer and reprogram.
If functionality is not restored, then timer might have gone bad.
3) Question posted under ET724 in-wall timer.
If you have different timer, then add a comment.
There are at least 2 different versions of this timer. Grasslin, and GE and now Intermatic, and maybe others have made -or- are making this timer -or- have sold rights for somebody to make this timer.
http://waterheatertimer.org/Intermatic-timers-and-manuals.html#Ei500http://waterheatertimer.org/pdf/et724-timer-instructions.pdf4) The screen blanks during power failure.
Check that timer is getting power, and breaker is not tripped.
Frequently, power outages cause timers to fail when power turns on again and power surge affects timer.
5) Known versions of this timer are connected to Neutral wire. Timer has internal, non-replaceable battery that can go bad.
If timer-white wire is not connected to neutrals, then display will not operate.
Neutral wires are white wires that are twisted together, covered with wire nut and pushed to back of box.
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