I can't tell where you are with this timer: if light bulb is burned out or if you don't have manual, or if circuit or timer are not working.
Open following links to identify timer and for do-it-yourself troubleshoot.
http://waterheatertimer.org/Woods-timers-and-manuals.html#troubleshoot
http://waterheatertimer.org/Woods-timers-and-manuals.html#59377
Add a comment and say exactly what you've done so far, and include exact brand and model number of timer for best answer.
Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.
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