Can someone help

<Moved from Home electronics>

Blue is a non standard color

Red is R
Green is G
White is W

Blue is probably Y

Blue is the common wire, Red is a/c, Green is blower, White is heat. Sometimes yellow replaces red.

Blue is the common wire, Red is a/c, Green is blower, White is heat. Sometimes yellow replaces red.


When does red ever replace yellow?? Blue replaces yellow.

Blue is the common wire, Red is a/c, Green is blower, White is heat. Sometimes yellow replaces red.

I guess its according to what world you live in,, in our world red isn`t replaced by yellow