Here's our general wiring guide for Zooz S2 switches (wiring guide coming soon). If you have the switch installed in a multi-point set-up like a 3-way, 4-way, or 5-way (additional diagrams coming soon), make sure to refer to the relevant diagrams and try to compare your wiring to that shown in the illustrations.
If you're unable to locate the source of the problem, take some pictures of all the boxes in the installation according to the angle and instructions shown here. Then reach out to us with the images so we can try to troubleshoot the installation remotely.
Also, check that the switch is connected to a compatible load. Zooz shouldn't be connected to motor loads like ceiling fans, as detailed here. Improper loads like fans, home appliances, and ballast tubes may damage the switch immediately and prevent it from working correctly.
Along with compatible loads, verify that the wattage on load is within the device's specs to make sure the device hasn't overloaded.
If you suspect that the type of load you've connected has damaged the switch or the unit has been overloaded, reach out to us. We'll be happy to help!