I've recently moved into my first house and am looking to replace the existing basic thermostat in the home. Here is a picture of how I found it wired:
Researching the wires, I've read that commonly W2 is suppose to be white and blue wire is usually C (Common); and that W2 is used in 2 stage heating systems. So now I'm concerned if this old thermostat was not wired properly? Or if my wire colors are just uncommon...
I'm unsure if my furnace (Amana GUIS070CA35) is actually two stage or not. When I get the new thermostat should I just plug the blue wire into C and see what happens? The thermostat I'm looking at would use the 24V common wire to power the display. So I'd guess if it didn't power up that the blue wire was actually for W2.