15004 timer slide switch is to control timer mode.
When switch is one direction, lamp is ON all the time.
When switch is other direction, timer programs control lamp.
See 15004 timer instructions on following link:
http://waterheatertimer.org/GE-timers-and-manuals.html#15004
Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.
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