Help with wiring Nest Heat Pump

[epiphini]

I need help wiring my Nest

[Patrick_Caezza]

Give this wiring a try.

Blue - C to C

Orange - O to OB

Red - RH to Rc (jumper to RC not needed)

Green - G to G

Yellow - Y to Y1 (jumper to W not needed)

[epiphini]

I tried that but it wont even power on.  Any other solutions?  I reinstalled the old thermostat and it worked fine.

[epiphini]

This is how i am wiring it.  It won't turn on.  When i connect my old thermostat, it turns on

[Ryan_G]

Hey epiphini,

I just wanted to follow up and see if you're still in need of help? Please let me know, as I would be happy to answer any questions you may have.

Best regards,

Ryan

[epiphini]

I even bought a new Nest and tried that, not working.

[Ryan_G]

Hey there,

Just wanted to jump in here to check to make sure that you saw our response. Please let us know if you have any other questions or concerns as I will be locking this in 24 hours.

Have a great day.

Best regards,

Ryan

[epiphini]

All set.  C wire wasn't connected at the furnace.   Thanks.

[Ryan_G]

Hi epiphini,

Thanks for the update.

It is great to hear that it is up and running well now. Connecting a C wire would eliminate problems not only with battery but for your HVAC behavior as well.

If you have any other questions, don't hesitate to get back to us and we'll be glad to assist you as this thread will now be locked.

Best regards,

Ryan

[dhx227]

It would appear you have wired everything as you should.   What we don't know is if those wires are in fact connected at the A/C side.   Do you know if the old thermostat uses batteries?   It's entirely possible the (C)ommon wire (Blue) is not actually connected at the A/C.