You posted under ST01C Intermatic battery operated timer.
If you have different timer, then add a comment.
Let's review ST01C timer for a moment.
Programming will stay inside timer memory indefinitely until timer no longer works.
Even if battery is removed, programs remain. Current time setting does not remain in memory.
If battery goes dead, then current time will disappear, but programs remain forever.
If previous programming was correct, you might only need to set current time,.
In that case, you do not want to 'reset' timer and clear memory.
If you want to clear old programming entirely, then you can 'reset' timer using following instructions.
Press and hold on-off button, and then use paper clip to push in reset button for 3 seconds.
Release reset button but keep holding on-off button until INIT displays momentarily.
Release on-off button.
If display does not show, then timer battery is bad, or timer is bad.
For instructions how to set current time, click link below.
In addition to current time, the link has ST01C manual and also has EZ to follow instructions and photos for setting on-off times (but not astro times)
http://waterheatertimer.org/ST01C-program.htmlInstructions are different for astro dawn to dusk.
Add a comment at any time if you need free help with specific steps in the manual.
If you do not want to read the manual or open a link and read the steps or add a comment for further free help, then you can pay a fixya expert for phone support and that person will walk you through the steps while on the phone.
Keep in mind that ST01C timer has 1 year limited warranty, and your timer might be broken.
In that case you should try the free steps first.
had to change batteries and can't set
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