The ST01C is unnecessarily difficult to program.
And the manual is confusing and unclear.
I wrote a page to help ST01C users who want specific on-off times (not dawn to dusk):
http://waterheatertimer.org/ST01C-program.htmlI test and work with timers each day, and I had to fool with the ST01C for an hour or more.
First thing I learned is how to clear programs and start over.
Hold down ON-OFF and press reset button with paper clip.
Next thing I learned is to set programs before setting current day and time.
That way when you have to reset and start over, you are not re-setting current day and time each time.
Set current day and time after programming timer.
Timer doesn't have to be wired into the wall to set programs.
Here's a tip:
Program1 is ON
Program2 is OFF
Program3 is ON
Program4 is OFF
The key is watching the small light bulb icon on display when programming.
When light bulb is dark, that is ON
When bulb is is light, that is OFF
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