Intermatic timers might require reset-and-reprogram after battery replacement.
To reset, hold down on-off button and push reset button once.
Keep holding on-off button until display changes.
Release on-off button, and display should blink 12:00
Try cleaning battery carriage contacts with alcohol and make sure battery polarity is correct.
If functionality is not restored, then replace timer.
Intermatic EJ500 comes with 1 year limited warranty and is rated for incandescent light bulbs only.
http://waterheatertimer.org/Intermatic-timers-and-manuals.html
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