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Honeywell THX9421R

WillLenn
Community Member

Honeywell THX9421R thermostat controlling our heat pump (furnace and A/C).  Only two wires connected, Red and Blue.  Green, yellow and white are not connected.  Is this compatible with google nest and if so what is the proper wiring.  

Thanks,

Will

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1 REPLY 1

Ryan_G
Community Specialist
Community Specialist

Hi WillLenn,

 

Thank you for reaching out and we're sorry for the delayed response.

It looks like the cooling or heating is only connected to your current thermostat. For us to be able to verify the compatibility with Nest Thermostat, it is best to check the wiring from the terminal on your HVAC itself.

 

You can then check it further using the Nest Thermostat compatibility checker

 

Let me know how it goes.

 

Regards,

Ryan