Nest Thermostat & Ruud/Rheem

[TheSnarkyCat]

Hello! I have a gas Ruud [R801SA050314ZSB] furnace and a Rheem [RCF2414STAMCA] air conditioner setup. I changed out the old dial thermostat, which has yellow, white, green, blue, and red wires however the blue wasn’t used and runs to the furnace where it’s not connected. I keep getting the low battery alert on the Nest thermostat and have to keep taking it off and charging it.

I opened the furnace door and looked at the control board. On the C terminal, there is a black wire that runs out and to a Safety Switch SS2 that is connected to the Rheem unit. There is also the unconnected end of the unused blue wire at the thermostat. My question is, can I connect the blue wire to the C terminal on the control board along with the black wire that’s already there?

Thank you in advance!

[DanMag · Accepted solution]

Yes that is exactly what you need to do. Mine was the same way and I connected it and it keeps charged just fine. One issue you may have is if you go through the set up and it ask what wires you have connected. Do not put the C wire as having it. Just say the red,yellow,green and white. Orherwise you will get an error message like R294 or something like that. I went through multiple forums before I found out how to make it work. Simply state you have those 4 hooked up even though you have 5. 

[DanMag · Accepted solution]

Yes that is exactly what you need to do. Mine was the same way and I connected it and it keeps charged just fine. One issue you may have is if you go through the set up and it ask what wires you have connected. Do not put the C wire as having it. Just say the red,yellow,green and white. Orherwise you will get an error message like R294 or something like that. I went through multiple forums before I found out how to make it work. Simply state you have those 4 hooked up even though you have 5. 

[TheSnarkyCat · Accepted solution]

Thanks for your help! I’ve resolved this issue. 

[DanMag]

I am glad to hear ou got it working. Took me some time to figure it out but mine still works great

[EdwardT]

Hi folks,

@DanMag, thanks for the help!

@TheSnarkyCat, how's it going with your Nest Thermostat? Still need our help?

Thanks,

Edward

[MelbaDT]

Hi, 

We haven't heard from you in a while so we'll be locking this thread if there is no update within the day. If you have any new issues, updates or just a discussion topic, feel free to start a new thread in the Community.

Best, 

Melba

[DanMag]

Yep. Glad we have a board like this to help eachother

[MelbaDT]

Hey folks, 

Thanks for responding and I agree with you, DanMag. Glad to have you here on this Community page. 

TheSnarkyCat, awesome — we're happy to hear that. Give yourself a pat on the back for a job well done!

Cheers, 

Melba

[MelbaDT]

Hey folks, 

We haven't heard from you in a while so we'll be locking this thread if there is no update within the day. If you have any new issues, updates or just a discussion topic, feel free to start a new thread in the Community.

Best, 

Melba