@Peter_Kawa Thanks again for your help.
The load is more than 3 Watts.
After removing the SSM-U02 using Tools - Dives hitting the bin icon, the device SM-U02 was still visible as a node in the Tools Zigbee network panel.
After resetting the Zigbee network, all dives are removed from the Tools Zigbee network panel. I paired successfully the devices, except the SSM-U02. The device SSM-U02 is death and don’t show any response. The led on the device is not flashing red or blue. Have to return the SSM-U02 to the shop and buy another one.
A have currently a few flows. Fixing them will be not a big hassle.
