The following wiring diagram works for Woods, GE, Hagar, Leviton, Sylight, Utilitec, some Intermatic in-wall timers.
It does not apply to Aube timers or Intermatic battery-operated timers.
If the wires are not connected correctly, the timer will not operate as expected.
Click the manual override and see what happens.
If the lights do not turn ON with the manual override, then the wiring is suspect.
If the lights blink, then you have put the red and white wires together.
If the lights turn ON, but timer clock is not working, it is possible you have the black and red wires reversed.
If the white wire is not connected correctly, the clock mechanism will not operate.
Review the wiring.
Black-timer wire goes to black-hot-wire from breaker
Red-timer wire goes to black-wire going to Load (lights)
White-timer wire connects to the Neutral wires that are usually twisted together and covered with a wire nut.
IF your box does not contain those white wires, then you can work-around by connecting white wire to bare ground wire.
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