Nest Thermostat Gen 3 wiring

[Metalsiege]

 

I’ve had my Nest installed and running fine since May, but during the colder months now it keeps my AC unit outside on at times for no apparent reason. The house has a heat pump and outdoor AC unit that connect to a thermostat upstairs and one downstairs. Below is what the original thermostats wiring looked like before I switched to Nest. 

 

 Below is what Nest shows as wiring setup inside the app and how it’s wired on the units. Do I need to change the wiring around to get my system working probably?

For reference here is the original thermostat plate without wiring and the back that thermostat. 

 

 

[Houptee · Accepted solution]

Read this where Cooling Wizard explains how to check the setup for your heat pump.

https://www.googlenestcommunity.com/t5/Nest-Thermostats/Nest-3rd-Gen-Aux-Heat-Not-Working-cold-air/m...

[Markjosephp]

Hello there,

Thanks for helping here, @Houptee.

@Metalsiege, I hope you've got the answer you're looking for. If you're still in need of assistance, feel free to let us know.

Regards,
Mark

[Markjosephp]

Hello Metalsiege,

I wanted to see if you still needed help. Please let us know if you have any other questions or concerns.

Thanks,

Mark

[Juni]

Hello there,

We haven’t heard back from you, so I'll be locking this thread in 24 hours. Feel free to create a new one if you have more questions or have other concerns in the future.
 

Regards,

Juni