http://waterheatertimer.org/ST01C-program.html#ST01CThe ST01C timer has a battery that runs the clock.
The wires are black, red, blue and green.
1) You are replacing a single-pole switch so the timer-red wire is capped off.
Timer-red is not used.
2) The green wire connects to bare ground wire.
3) There are two wires left.
Your switch has 2 black wires.
Timer-black wire connects to black-Hot-wire-from-breaker.
Timer-blue connects to black-wire-to-Load.
4) To start:
Connect your timer-wires to either black wire.
Push the ON-OFF button located on timer.
If the lights turn ON, then your wires are correct.
If lights do no turn ON, then swap the two wire with each other.
If you have more problems, add a comment.
Tip: for easy programming, you can set all your programs before you connect wires.
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