7 wire system

[mrmr64]

I have a 7 wire thermostat and I got a 6 wire nest pro. The extra wire seems to be a yellow wire for a possible 2 stage cooling heat pump. Is this compatible?

[moralesvicente]

Hi @mrmr64, 

Thanks for posting here in this forum. I understand you’re looking for help with a seven-wire system and want to know if that extra wire can be used for a second stage of cooling with a heat pump. It's a pleasure to assist you.

To provide you with accurate information, please help me out by answering the following questions:

• Can you share a picture of the thermostat wiring configuration?
• What model of thermostat do you have? For your reference, check out this article: How to tell which Nest thermostat you have. 

Any additional details you can provide will be helpful.

Regards,

Daniel