11-30-2022 10:29 AM
I used the google Home install IOS app, and it says my thermostat is incompatible, but when I use the online checker, it says maybe. RH and RC are jumpered. I perused the blog but didn't see a good answer on what r wires to connect where. I purchased the Google Nest Thermostat. Help, Curt
11-30-2022 11:37 AM
You never use jumpers with Nest or any modern smart thermostats.
Connect all wires to the Nest using same color and terminals as the old tstat.
However you will need to use that Blue wire for your C common wire.
Then you have to go to the equipment and connect blue to the C common on the furnace terminal strip.
Some furnaces if older do not have a C terminal so if you dont see one get the make and model of your furnace and report back.
12-01-2022 09:03 AM
Thanks for the help; when you say"Then you have to go to the equipment and connect blue to the C common on the furnace terminal strip." is that on the furnace itself? I do have an unused blue wire available at the current thermostat.
12-01-2022 09:16 AM
Yes on the furnace you need to follow the thermostat wire to where they all connect to the screws and see if you see a C screw aka common. Connect the blue to that screw and also at the Nest to the C terminal. C is like negative on a battery and Red is like positive so you need the C wire connected to keep the Nest powered up so the battery doesn't run down.
12-05-2022 11:18 AM
12-05-2022 02:17 PM
Thanks for checking, I still need to crawl into the attic to see if the c wire is connected
12-06-2022 08:49 AM
Sounds like a plan! Thanks for making an effort, @c95658. Please keep us posted on how it goes; we would be glad to know what the result would be.
12-09-2022 09:34 AM
@c95658 we're bumping up this thread to make sure that everything is covered, so we can keep the ball rolling. In case you have an update, you know where to find us.
I appreciate the help, Mark and Houptee.
12-12-2022 09:27 AM
Hi there everyone,
Just one quick final check in here since activity has slowed down. We'll be locking the thread in the next 24 hours, but if you still need help, I would be happy to keep it open. If there's more we can do, just let me know.