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Nest wiring issues or setup.

Jet111
Community Member

PXL_20220820_013530343.jpg

 here is picture of old tstat. Maybe hard to see, but white wire was W2, blue wire was O/B. Green of course was G (fan), red was RC, and yellow was Y. This is dual system with gas heat as aux. I wired to nest using Green - g, white - W2, blue - O/B, yellow to Y1, and red to RC. Completed setup in equipment, and try running system but outside unit does not run? Any thoughts. I realize the old thermostat was only wired with 5 wires, but all the diagrams I see for nest with heat pump show at least 6 wires.

4 REPLIES 4

Houptee
Silver Product Expert
Silver Product Expert

Look up the old T stat find the manual with wiring info to make sure what the left hand terminals are for S1 S2 .

I don't see a common wire so see if there is an extra color wire in the cable you can use for common.

Rc is + for the a/c heat pump, Y gets + power when tstat asks for a/c and turns on outdoor unit,  o/b is the control that switches the heat pump from heat mode to a/c mode, that is normally orange wire.

post pics of the connections at the indoor unit and outdoor unit.

 


Houptee -- NJ Master HVAC Licensed Contractor

MelbaDT
Community Specialist
Community Specialist

Hey folks, 

 

Thanks for helping, Houptee. 

 

Jet111, I'm chiming in to ensure that you're all good here. Feel free to let us know if you still need our help. 

 

Best, 

Melba

MelbaDT
Community Specialist
Community Specialist

Hey Jet111, 

 

How's it going with your thermostat now? Still need our assistance?

 

Best, 

Melba

MelbaDT
Community Specialist
Community Specialist

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