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Nest learning thermostat v3 long cycles

Community Member

Just installed nest learning thermostat v3 and 1st thing I noticed was long the cooling cycles are. I set my temp to 78 degrees and it will run my AC for a whole hour. 
I just switched from the ecobee premium because I hated how it didn’t have a robust home/away feature. But man that thing was so much more efficient and comfortable. It would cycle every 15-20 minutes and always maintained 78 degrees plus/minus 1 degree. 
with the nest, I have been completely disappointed. I have been manually adjusting the temp because I would feel cold when the cycle runs long and feel hot when it’s off for extended time. 

anyway to fix this? 


Community Specialist
Community Specialist

Hi I-c, 


Thanks for bringing this to our attention, and I'm sorry to hear about the situation. I want to check if you are still in need of any help. If so, please follow these steps: 


  1. Confirm that the HVAC system is activated, and remove the display. If the symptom persists after you remove the display, the situation may be due to V-Detect. To confirm if this is the case, remove the Y1 wire from the terminal.
    • If the AC no longer runs continously after you remove the Y1 wire, let us know.
    • If the situation persists, move to the next step.
  2. Turn off your power breaker, then remove the thermostat display off its base. After that, move the G wire to the Y1 terminal if since the situation is with the AC. If the result of this step is an immediate activation of the equipment that experiences the symptom, let us know.


Let us know how that works.




Community Member

The system turned off after pulling off the display. What does that means?

Community Specialist
Community Specialist

Hi there, 


Thanks for the follow-up information. If the system turns off, then this is not caused by the transistors. So, we should investigate whether the behavior is caused by power sharing, miswiring, or other system causes. It's also possible that this is normal behavior for your system. Check on the following:


  1. Please help us with a photo of how are the thermostat wires connected to your thermostat base.
  2. Make sure that all thermostat wires are firmly connected to each terminals.
  3. Gather the power readings of your thermostat by going to its Settings > Technical Info > Power (Battery, VOC, VIN, and lIN).




Community Member

There’s no way to post pictures…..why would you suggest such thing….


yellow wire to y1

green to g

white to w1

Blue to c

red to Rh


Battery: 3.888v

voc: 30.67v

vin: 30.67v

Lin: 200mA(c)

Community Specialist
Community Specialist

Hi everyone,


I'm sorry for the delay. I know it's been a while already. I'd like to know more about your concerns. 


@Dav2, thanks for letting us know. A few questions: what type of Nest Thermostat do you have? In what country are you located? Please provide your thermostat's power reading.


@I-c, thanks for providing the information above. It looks like your Nest Thermostat detects sufficient power coming from the wires. The readings indicate as well that you have a C wire. How's your thermostat? Does the issue persist? 


I appreciate the input, Zoe.


Kind regards,


Community Member

Following. Have sane issue