
Firstly if your switch has wires on the sides these can block the contacts, you need to make sure the contacts go past them. If your wiring was done by a good electrician, they will often wrap the contacts in tape for extra security, which now needs to be removed. Second, there's a photocell in the front, so they only turn on in dark rooms. You can put your finger on the photocell to check if the light in the room is on.

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