Open following link for Sylvania timers.
http://waterheatertimer.org/Sylvania-timers-and-manuals.html3 numbers is correct.
77482 and 77468 will be inside same time zone.
So set 3 digits 774 and timer knows where you are astronomically.
The timer does not need your full mailing address zip.
Press red reset button.
Press mode button until ZIP icon displays.
Depress and HOLD clear zip-set button until display flashes.
Set first 3 area code numbers.
If zip set is not working correctly, then timer is defective.
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