Ecobee3 Setup and furnace only has W G R

Question

My existing thermostat has 4 wires (missing C) so I'm attempting to use the Power Extender Kit (PEK) at the furnace control board. Only problem is, I only have 3 wires that are obviously labelled at the furnace (W, G, R). I have central air and I'd like to get my Ecobee3 setup if possible. Help.
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user76730 · Answer

It is hard to see from the picture but if you look at the bottom 2 terminals on the transformer the one on the right is red and the one on the left is kind of blue/lavender. Red is typically “R” and the other one is typically the “C”. The top two wires are line voltage, don’t mess with those.

Answered by user76730 on July 21, 2021

Ecobee3 Setup and furnace only has W G R

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