I bought a dimmer light switch with metal faceplate and went to swap it out for the old rocker switch but noticed the installed rocker has two red wires and no earth so I cannot use the new dimmer so I'll swap it for a plastic one.
On the old switch I cannot see anything to indicate COM or L1. Does it matter which red goes in COM/L1.
On the old switch I cannot see anything to indicate COM or L1. Does it matter which red goes in COM/L1.