
Depending on the position of the (newly rewired) mechanical switch, the sensor either works or it does not. Unfortunately, that did not improve the situation much. So I tried to follow Lutron's diagram linked to by mac and found it easy to connect the sole red wire on the 3-way mechanical switch to one of the black wires. Should I replace it with a 1-pole switch now, that I only have 2 switches on the circuit?
Figure out, what's wrong with the current setup - why is the existing mechanical switch misbehaving? I'm sure, I miswired something. This would provide the most complete sensor-coverage. Two occupancy sensors, that can work together - adding the second to where I currently have the semi-functional mechanical switch. It will let me remove the remaining mechanical switch. This would, probably, be the easiest and most sensible option. One occupancy sensor with a sensor looking up as well as sideways. While the new sensor works perfectly well detecting humans on the same floor, if a person descends the stairs from the upper floor, the light does not go on until one descends to the middle of the stairs - when the feet come to about the same level, where the sensor is. This proved to be incorrect - sometimes it has an effect, some times it does not, and some times it disables the sensing switch (it clicks, but the light stays off). I was hoping, the second of the remaining mechanical switches will remain in control to allow explicit control of the light. Predictably, one of the remaining mechanical switches stopped having any effect whatsoever. I started with replacing the existing 4-way with a 3-way sensing switch from Lutron ( MS-OPS5M). 4 wire motion sensor light wiring diagram code#
The wiring was done very recently and, I'm certain, in accordance to modern code (which may help you figure out the diagram, even if I don't know it). There is a stairwell in our house, which is currently lit by a fixture controlled by three switches: a 4-way and two 3-ways.