I have a nest thermostat connected to baseboard hot water and central air. I'm looking to add a C wire to the nest for constant power. Can someone confirm if I should connect blue to to brown from the unit?

I can't figure out how to fix the rotation 😕 enter image description here enter image description here enter image description here


Yes, you're correct

Based on both the way your air conditioning compressor is wired and on the wiring diagram for your air handler, the brown wire in the thermostat wiring compartment is indeed the C wire you're after. So, simply incorporate the blue wire into the existing wirenut junction at the air handler end, and you'll have a C wire at your thermostat!

  • Hooked up blue and brown and the unit is much happier. Jun 18 at 22:16

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.