cancel
Showing results for 
Search instead for 
Did you mean: 
Replies are disabled for this topic. Start a new one or visit our Help Center.

Only 2 wires on my current thermostat

Chezwards
Community Member

My current thermostat to the Mitsubishi mini split(heats and cools) has two wires A & B, red and white; how do I wire it up to my Nest?

4 REPLIES 4

CoolingWizard
Platinum Product Expert
Platinum Product Expert

Your mini split system does not use the typical 24 V system control. The Mitsubishi uses a digital communications over the two wires and is therefore not compatible with the Nest or any traditional thermostat in fact.

The AC Cooling Wizard 

NestPro, Google Pro, Mechanical Engineer and HVAC service company owner.
If my answer solved your problem, click Recommend this Answer below, and If it helped you, please give a Kudo.

EdwardT
Community Specialist
Community Specialist

Hi folks,

 

@CoolingWizard, thanks for the help!

 

@Chezwards, how's it going with your Nest Thermostat? Still need our help?

 

Thanks,

Edward

EdwardT
Community Specialist
Community Specialist

Hey Chezwards,

 

It's me again. I wanted to check back in to see if you have other questions and concerns. Feel free to let me know if you do. 

 

Thanks,

Edward

EdwardT
Community Specialist
Community Specialist

Hi Chezwards,

 

I'm just checking in to make sure that you've seen our response. Please let us know if you have any other questions or concerns as I will be locking this in 24 hours.

 

Thanks,

Edward