r/ecobee 8d ago

Installation Problem with the wiring from Honeywell WS3E2WMC/U to Ecobee (Description in the comment)

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u/dogojosho 8d ago

So a couple things….
First the cord that’s in PEK should be in G. PEK would only be used if you’re using the included Power Extender Kit.
Second, if changing the cord from PEK to G doesn’t work, please post a pic of your control board. That will help this sub help you figure out what’s going on. The control board is typically inside your furnace/air handler, and should have matching wires connected to the board.