You don't say if this is new timer installation.
Or if timer was working before and suddenly stopped working.
I also own Woods 59017 timer from Home Depot.
1) New timer installation:
Open following link to access manual and read wiring instructions.
http://waterheatertimer.org/Woods-timers-and-manuals.html#590172) Old timer that stopped working:
If timer dial does not rotate, then the timer is broken, does not have power, or is wired wrong.
If timer stalls when it gets to a pin, then the clock motor has gotten weak, and is overheated and will stop working.
3) Buy new GE 15070 timer from Home Depot for $18
http://waterheatertimer.org/GE-timers-and-manuals.html#150704) Buy new Woods 59017 at Amazon for $11 plus shipping
http://www.amazon.com/Woods-59017-Mechanical-Repeats-Switch/dp/B002MO3LWQAdd a comment for more free help.
Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.