On the Ecobee Smart WiFi Thermostat site you can click which wires you have on your thermostat and then an email is generated (you attach a photo) and you get an email back that will say if your thermostat is compatible or not. Nest does the same thing, we think they did that first, but either way, we sent an email to both at the same time, we’ll update the post and tell you which one got back to us first!
Date: October 29, 2015 at 5:23:31 PM EDT
To: [email protected]
Subject: Compatibility Checker Result – System may not support full configuration – Please advise
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?
Please see the attached a photo of my thermostat.
My thermostat has the following wires: R, G, WW1, OB, YY1,
Date: October 29, 2015 at 5:23:28 PM EDT
To: Nest Support [email protected]
Subject: Compatibility Check
My wires are: G, O, R, W, Y
Am I compatible? I’ve attached a picture of my old thermostat’s wires to help.
UPDATED 10:08am ET / 10/30/2015 ECOBEE WON!
ecobee Support (ecobee Support)
Oct 30, 10:08 AM
Hello Phillip, thank you for contacting ecobee Support and for your interest in the ecobee3 HomeKit enabled thermostat.
Based on these connections you have a 1-stage heat-pump with 1-stage of aux heat, this is a compatible system. Because you do not have C(Common) wire the ecobee3 comes with a supplied PEK module, this can be used in your application however the O/B wire will not get connected through the PEK module but rather connect directly from the thermostat sub-base to the HVAC equipment directly.
See video & knowledgebase link for further instructions:
Let us know if we can be of further assistance.
The Customer Support Team
250 University Ave, Suite 400
Toronto, ON M5H 3E5T: 1-877-932-6233 | F: 1-866-592-7344
UPDATE! 9:31pm ET 10/31/2015 – Nest (Google replied!)