Wiring confusion!

[Fling_Wing]

 

I’ve wired a few of these before with no issues, but this wiring has me stumped. Does anyone have an idea of how I need to transfer these wires over to the nest? 
 

[Race200mph]

I hear ya!  These HVAC people gotta be brain dead when they can’t keep to code when technology caught up!

I’ve Central A/C and Heating via an Air Handler…

My A/C via outdoor Condenser/etc… Blue (they used Red) / Yellow (they used White) to call for cool.

My Heat via basement Gas Boiler/etc… Red (they used Red) / White (they used White) to call for heat.

Air Handler has Red, Green (fan), Blue (common?!?)

so the wired my basement boiler to. 24v Relay, triggered somehow by the thermostat with no white ( call for heat) to the air handler… it went to yellow!!! To trigger the fan?!? Omg I’m lost

[Fling_Wing]

I’m just scared to blow a fuse or something. I moved from way up north to way down south so hvac is a little different. 

[CoolingWizard]

@Fling_Wing, You have a Heat Pump with Auxiliary Heat. Your wires will be:

AC Cooling Wizard

[Jenelyn_O]

Hi there,

Thanks for posting in the Google Nest Community forum. I just want to check if you were able to see the response above about your Nest Thermostat proper wiring. Please let us know If you still have questions in mind.  

I appreciate your help, @CoolingWizard.

Best,

Jenelyn

[Jenelyn_O]

Hi folks,

I wanted to follow up if you still need help. Please let me know if you’re still having any concerns or questions from here, as I would be happy to take a closer look and assist you further.

Thanks,

Jenelyn

[Jenelyn_O]

Hi everyone,

@Fling_Wing and @Race200mph, just one quick final check in here since activity has slowed down. We'll be locking the thread in the next 24 hours, but if you still need help, I would be happy to keep it open. If there's more we can do, just let me know. 

Regards,

Jenelyn