Red Wire In Switch. We'll cover the easier scenario first. Before you begin, make sure all electrical circuit breakers related to the wiring are turned off.
You should have gotten a wiring diagram with your switch. If turning the switch off turns the wire off, the red wire delivers power from the light switch. We'll cover the easier scenario first.
The red wire was probably part of the dimmer switch and should now be gone, but if it isn't then just cap it off.
IEC, AC: Most of Europe abides by IEC (International Electrotechnical Commission) wiring color codes for AC branch circuits.
The new switch has red, black, green and yellow wires. Switch boxes in older homes usually used the white wire as a power wire, not a neutral. It could be there is (or once was) a three-way switch in play.
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