I have a 3 way light switch which works fine with a regular light switch. That is, I can control on/off without issue from either switch.
I moved one of the switches to a timer, the Intermatic ST01, which according to my research, should work fine. Many people who have issues with flickering lights are advised to use this switch as it's switching mechanism works with low loads. I following the existing wire (common to common, traveler to traveler etc).
When the timer is hooked up I have the following:
Turn Intermatic On with Regular Switch Off: Lights turn on correctly
Turn Intermatic Off with Regular Switch Off: Lights turn off correctly
Turn Regular Switch On with Intermatic Off: Lights turn on
Turn Regular Switch Off with Intermatic Off: Lights turn off (flicker)
The flickering is at a high rate, probably once or twice a second. I can hear the intermatic's switch clickign on/off during the flicker.
Any ideas on what's going on? Is it possible something is wrong with how the 3 way switches were wired before and I need to modify the timer switch/regular switch for the timer to work?
Best Answer
Thanks for the tips.
I had removed all the wires, taken pictures and was going to test the configuration again to double check that everything was correct. I was emptying the timer box and noticed a black wire there. I thought it was odd to see a wire there.. I re-read the instructions and it turns out I missed a step! As you can see below, there is a step "E" - After installing that wire the switches are working correctly.