After many years of use my WS4777, 3-way wall switch has a problem. Suddenly the slave would not turn on the lights. So I replaced both units. No change. The slave will turn off the lights. The master will turn the lights on and off. Remote control of the lights is fine.
I created a test setup with the removed units and everything was correct.
The power accesses the setup via the slave and the master connects to the two lights in the hall.
I would most appreciate any ideas to solve this problem.
Robert