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Thermostat wiring wire code color diagram decoded Thermostat wiring color code decoded Thermostat wiring diagram mean letters wire 2wire only where ifixit thermostats which goes

Thermostat wiring color code decoded - YouTube

What all those letters mean on your thermostat’s wiring

Thermostat wiring color code decoded - YouTube

What All Those Letters Mean on Your Thermostat’s Wiring - iFixit