Honeywell THX9421R

WillLenn — Thu, 27 Jan 2022 01:43:59 GMT

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

Re: Honeywell THX9421R

Ryan_G — Wed, 02 Feb 2022 00:02:06 GMT

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

topic Re: Honeywell THX9421R in Nest Thermostats

Honeywell THX9421R

Re: Honeywell THX9421R