Occasionally we do see some manufacturer’s defects regarding the timer, or occasionally a dead battery. However the most common problem is that the user is simply not holding the button down long enough.
If you hold the button down until it flashes 00 (around 5-7 seconds) it should turn on. Then it will count-up in 1 hour increments. For more information, see page 17 of the User’s Guide for details on how it works. If after you try that, and it still doesn’t work, contact us and we’ll glad send you a replacement.