Below are links to digital timers to help identify your timer.
Manuals for each timer appear on page.
Programming takes patience, which might be why your customer wants you to do it.
And these 1-year warranty timers go bad, and then timer will not reprogram, which may be another reason why customer wants you to do it.
Intermatic EJ500 and ST01C are battery operated, and will not program if battery is low.
Aube has rechargeable battery that is not replaceable, and this timer will not program if battery is bad.
Other timers shown below have clocks that operate on 120V circuit and require white neutral before display lights up.
Generally each programming is same: You set current time. Some timers you set daylight savings time. Some timers are 7-day, and some offer dusk-to-dawn. For 7-day, you set event1 ON and then event1 OFF for up to 7 programs. You choose the days for each event to operate. Before programming, make a schedule so there are no overlaps or conflicts in programming.
With Intermatic EJ500 and ST01C, event1 is the ON event and event2 is the OFF event, up to 40 events.
Add a comment if you hit trouble spot when programming.
Also fixya offers live phone support for a price.
Intermatic EJ500 with 7-day or dusk-to-dawn
Programming remains in memory forever, so you may only have to re-enter current time.
http://waterheatertimer.org/Flipdown.htmlIntermatic ST01C with 7-day or dusk-to-dawn
http://waterheatertimer.org/ST01C-program.htmlIntermatic EI500 7-day
http://waterheatertimer.org/Programmable.html#EI500Aube timers are either dusk-to-dawn or 7-day
http://waterheatertimer.org/Aube-timers.htmlUtilitec 0192773 with 7-day and astro dusk to dawn
http://waterheatertimer.org/Program-wire-Utilitec-0192773.htmlUtilitec 0141224
http://waterheatertimer.org/Program-wire-Utilitec-0141224.htmlGE 15071 - 15086 in-wall timers: one has daylight savings time
http://waterheatertimer.org/GE-timers-and-manuals.htmlWoods 59018 in-wall
http://waterheatertimer.org/Woods-timers-and-manuals.htmlTork SS720 in wall:
http://waterheatertimer.org/Tork-consumer-timers-and-manuals.html
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