Simple 3 Switches In 2 Gang Box
So remove that nut on the white wires they re not neutrals and do not belong together.
3 switches in 2 gang box. Requires 25mm back box. In your basket. If you look at the 3 way switches on the other end of each cable you should find the same wiring.
Click collect deliver. You will need to make a larger opening and do some wall repair to get the new gang in and attached. Click collect deliver update.
I would remove the old box and move the cables into a replacement 3 gang old work box. Connect all three switches to the gang box. как подсоединить три выключателя в тройную коробку.
Check more videos about switches. Light fan led. Instead put a nut on each one individually and forget about them.
What you had on each switch. Requires 25mm back box. Black from 12 2 is on the black screw of the 3 way switch.
Black common red white travelers so depending on the switch position either the red or the white is connected to the black. Bulk save view offer. Red and black wire from 12 3 line are on two different screws of that 3 way switch.