cancel
Showing results for 
Search instead for 
Did you mean: 

Need c wire?

Hmmm
Community Member

Hi.  When installing, the installation app indicated that my 4 wire connection (R, G, Y, W) might not have enough power and offered a button for alternate instructions.  I didn't select that button and couldn't go back.  As it is, I expect that the installation will wear out batteries too quickly.  How can I fix it?

1 Recommended Answer

CoolingWizard
Platinum Product Expert
Platinum Product Expert

@Hmmm 

We can use one of those spare wires that are wrapped around the outside and turn that into your C wire.  We will need to connect one of those spare wires to the C terminal in the nest thermostat and then take the same colored wire back at your air handler connected to the C terminal inside your air handler.

AC Cooling Wizard

NestPro, Google Pro, Mechanical Engineer and HVAC service company owner.

View Recommended Answer in original post

7 REPLIES 7

CoolingWizard
Platinum Product Expert
Platinum Product Expert

@Hmmm 

are there any spare wires wrapped around the Brown thermostat cable that might could be used? or is this just a standard for conductor cable?

AC Cooling Wizard

NestPro, Google Pro, Mechanical Engineer and HVAC service company owner.


@CoolingWizard wrote:

@Hmmm 

are there any spare wires wrapped around the Brown thermostat cable that might could be used? or is this just a standard for conductor cable?

AC Cooling Wizard


 

Hmmm
Community Member

Hi AC Cooling Wizard.  Yes, there are several tiny wires.

CoolingWizard
Platinum Product Expert
Platinum Product Expert

@Hmmm 

We can use one of those spare wires that are wrapped around the outside and turn that into your C wire.  We will need to connect one of those spare wires to the C terminal in the nest thermostat and then take the same colored wire back at your air handler connected to the C terminal inside your air handler.

AC Cooling Wizard

NestPro, Google Pro, Mechanical Engineer and HVAC service company owner.

Hmmm
Community Member

Thank you very much!

gellis
Community Member

I’m not sure. I just had this thermostat installed in July of this year by Kettle Marine heating. They told me that I needed a C-wire. But how can I get it

CoolingWizard
Platinum Product Expert
Platinum Product Expert

@gellis ,

I they told you you needed a C wire, and they did not hook it up for you, then in all likelihood your thermostat cable has no spare conductors.  Perhaps you need to invest in a Google Power Adapter. 

AC Cooling Wizard

NestPro, Google Pro, Mechanical Engineer and HVAC service company owner.