I'm baffled. I want to install a Kasa HS200 in place of a mechanical switch to operate a ceiling light. The existing installation has 4 wires - black, red, white and bare copper ground. The machanical switch wires were connected as follows (looking at the wall): Black wire to top right connector on switch, white wire to bottom right connector, red wire to top left connector.
On the Kasa, I tied the white wire to the existing white wire, the existing black wire to one of the black wires on the Kasa, the existing red wire to the other black wire on the Kasa, and the green wire on the Kasa to the existing bare copper ground wire.
I connected the Kasa to my network with no problem. I can use my phone or press the Kasa to operate the Kasa, and I hear a click from the Kasa and see the indicator on the Kasa switch states. All good. However, the light the Kasa is connected to doesn't come on. I pulled the Kasa and put the mechanical switch back in and the light works as it should. Reinstalled the Kasa (checking carefully to make sure the connections were solid) but the light still doesn't turn on.
Any suggestions on something to try?