Nest Thermostat compatibility

[Danberry731]

I have model G4CVZ and compatibilty test states my system is not compatible. Current Honeywell thermostat wiring is Y, G, W, R & Rc. which thermostat do I need?

[Derickf]

Hi @Danberry731,

Thank you for posting in the community. I'm sorry to hear that the compatibility test indicated your system is not compatible. I appreciate you confirming the wiring on the compatibility checker and also sharing your wiring information. I'm happy to assist you.

To gather the necessary information, please answer the following questions:

• Could you please provide a picture of your current thermostat's wiring?
• What type of HVAC system do you have?

I'll be waiting for your reply.

Best regards.

Derick.

[Patrick_Caezza]

@Danberry731 

Is the a jumper between the R and Rc terminals on the original thermostat, or does it have separate wires connected to each terminal?

If there is a jumper, then it is compatible.

If there are two separate wires, then only the Learning Thermostats will be compatible. Either the 3rd or 4th Gen will work.