Next thermostat set up with my existing control only has two wires. (Nest thermostat has six wires)

[vimok]

Nest thermostat set up with my existing control only has two wires. (Nest thermostat has six wires)

Is it ok to use this Nest product or I have to return and get refund??

[sporfrog]

Ideally post a picture of the wiring for the old thermostat so that it can be verified. If they are low voltage wires they are likely R and W. If they are high voltage wires, or it is a proprietary thermostat, a Nest probably will not work.

The wiring block terminals of the Nest Thermostat are not required wiring. For example one of the terminals is for cooling.  If you don't have cooling Y is not used. Only the terminals needed for a particular HVAC system are used.

For more information see

Nest Thermostat Compatibility

Compatibility Checker

Learn about the common or C wire

[MelbaDT]

Hey folks, 

Appreciate your answer, sporfrog. Thanks as well for providing the helpful links.

vimok, how's your Nest thermostat now? Still have some questions about it?

Best, 

Melba

[MelbaDT]

Hey vimok, 

Checking back in — still need help with your Nest thermostat?

Best, 

Melba

[MelbaDT]

Hi, 

I haven't heard from you in a while so I'll be locking this thread if there is no update within the day. If you have any new issues, updates or just a discussion topic, feel free to start a new thread in the community.

Best, 

Melba