You’ve actually got a pretty standard setup honestly. Only difference I see is the electrician uses the red wire for common/line versus black on your 4 way. Code in the US doesn’t require specific colored wires for neutral, line, or travelers. Much of this is discussed in this thread:
But here is what you need to do, will teach you how to fish along the way. I will call the 3 gang box 1, the single gang with your 4way switch (one with two Romex wires) box 2, and your other single gang with a single Romex box 3.
Box 1:
- Lets start with the fan because its easy:
- The bottom wire on the current switch is your line from breaker. I know this because that wire is hooked into a bundle of wires that go to the other switches and connected to Romex 3.
- Hook this black wire into the line terminal on your fan switch.
- The top black wire, from Romex 1 is the load to fan, hook this up to the load terminal on the fan switch.
- Add 2 short white pigtail wires to the bundle of white wires. Each will be the neutral on smart switches - 4 way and fan.
- You are done.
- 4 Way switch:
- Line 3 is your line from the breaker.
- I know this because you will see several wires connected via wire nut that all go to each switch, except the 4 way.
- With 4 way, notice the red wire from Romex 4 is hooked into this same wire nut and if you look at Box 2 you will see the red wires bundled, and in Box 3 the red wire is hooked up to the “common” wire on that switch.
- With 3+ way switches one 3 way switch (ones with 3 wires versus 4 - Boxes 1 and 3) will have the line from breaker and the other will have load. In cases where load and line are in same box, like Box 1, the line is often sent to the other switch like is done in your case via the red wire.
- Remove the red wire from Romex 4 from the bundle, this will become your traveler on your GE master switch. Hook it up to the traveler terminal on the master switch.
- Add a short black pigtail wire to this bundle and that will be the line on your master switch.
- Use the other white pigtail wire you added to the white bundle of wires for the neutral on the master switch
- The GE switches have 2 holes for each terminal, hook up the white wire of Romex 4 into the other hole of the neutral. This will “send” neutral to the aux switches.
- The black wire of Romex 5 is your load, put this into the load terminal on your master switch.
- Put a wire nut on black wire of Romex 4 as you no longer need it.
- Line 3 is your line from the breaker.
4 Way Box 2:
- Put wire nuts on both black wires as you no longer need them
- Connect both white wires to the neutral terminal on your Aux switch.
- Connect both red wires to the traveler terminal on your Aux switch.
4 Way Box 3:
- Put a wire nut on the black wire as you no longer need it
- Connect the white wire to the neutral terminal on your Aux switch.
- Connect the red wire to the traveler terminal on your Aux switch.
For future reference in case you ever want a switched light on your fan, the red wire of Romex 1 in Box 1 that you see in the picture in the upper left side should be going to the fan box as well. You would need to hook up that wire to the fan light and install a switch or relay in Box 1 to make it work.
Enjoy the smart switches!