Thermostat Compatibility (Wires R, G, O, Y, C, E, W2, L)

Question:

I ran the compatibility checker with a wiring configuration and the tool reported that ecobee needs to take a closer look. Can you please let me know if my system configuration is supported?

My thermostat has the following wires: R, G, O, Y, C, E, W2 and OTHER (L). There are two rows.

 

 

Answer:

Based on these connections your system is a 1-stage heat pump with 1-stage of auxiliary heat. This is a compatible system with ecobee3/ecobee3 lite. Due to a few slight differences in wiring terminals between your existing thermostat and the ecobee, I will summarize the connections of your existing t-stat to >> ecobee:

R >> RC
C >> C
G >> G
Y >> Y1
W2 >> W1
E >> Not used (Emergency heat is managed the same way through the W1 wire instead)
O >> O/B
L >> not supported. (This is usually used to illuminate an LED when there is a issue with the heat-pump).