connect ecobee wihtout c wire

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Jul 14th, 2021 2:26 pm

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Jul 12th, 2021 8:08 pm

buysell2008 [OP]: Member; Aug 25, 2020; 351 posts; 88 upvotes; oshawa

Jul 12th, 2021 8:08 pm

connect ecobee wihtout c wire

Here is my old thermostat. I am assuming there is no c wire. there are really only 4 wires here.

I opened the furnace and still yet to find out where the control board is.
bit lost here.

need some help.

7 replies

Jul 12th, 2021 8:16 pm

cliff: Deal Addict; Aug 5, 2003; 2605 posts; 507 upvotes; North York

Jul 12th, 2021 8:16 pm

open that second panel down below with the sight window for the error codes, you'll see the control board.

As for the C wire, use the adapter ecobee includes in the box, it makes a virtual C wire for your thermostat out of your existing wires.

+3

Jul 12th, 2021 8:36 pm

buysell2008 [OP]: Member; Aug 25, 2020; 351 posts; 88 upvotes; oshawa

Jul 12th, 2021 8:36 pm

is this it?

+2

Jul 12th, 2021 10:23 pm

Jon Lai: Deal Expert; May 30, 2005; 48262 posts; 9157 upvotes; Richmond Hill

Jul 12th, 2021 10:23 pm

yes

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Jul 13th, 2021 10:43 am

buysell2008 [OP]: Member; Aug 25, 2020; 351 posts; 88 upvotes; oshawa

Jul 13th, 2021 10:43 am

Here is my final wiring map. does it look right enough for me to turn on the power from the fusebox?

Jul 13th, 2021 10:28 pm

cliff: Deal Addict; Aug 5, 2003; 2605 posts; 507 upvotes; North York

Jul 13th, 2021 10:28 pm

looks right from what I remember - but it's been 2+ years since I've touched it - no change to the humidifier & a/c wires right?

(and the rest should match up with what is in the ecobee app/printed install guide, right?)

Jul 14th, 2021 10:05 am

kanewtz: Deal Addict; Apr 19, 2010; 3029 posts; 1509 upvotes

Jul 14th, 2021 10:05 am

Do you have any spare wires you can use?

We just installed an Ecobee in our new house and there was no "C wire"...but the blue wire wasn't being utilized at all so we connected it to the Motherboard and used that as the "C wire".

As others have pointed out...you could just use the PEK and do it that way.

Jul 14th, 2021 2:26 pm

buysell2008 [OP]: Member; Aug 25, 2020; 351 posts; 88 upvotes; oshawa

Jul 14th, 2021 2:26 pm

correct. did not touch the humidifier and a/c wires.
i turned it on and both a/c and heater are working when i turned them on.

+1

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