I have three outdoor lights on one circuit with two switches. One switch controls one light and the second switch controls the two other lights. I replaced both switches with Leviton VPT24 timers. Both timers work fine. The single light works fine. The two lights work for a short while and then stop lighting up. I changed the bulbs thinking they were burnt out. The new bulbs worked for about an hour and then also stopped working. All three are CFL bulbs. The two switches are not using a 3-way installation.
Can anyone tell me why the two bulbs stop working after a period of time? It's driving me crazy! I'd really like to use these timers but they're useless if they make the bulbs stop working.
You may want to check with the manufacturer of the bulbs to see whether or not their bulbs will work on a timer. Also, make sure the timer has a good neutral connection. You may want to also use those bulbs somewhere else in the house to see if it is a bulb issue.