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Nest Thermostat is not sending signal to turn on reversing solenoid Valve

TigerRic
Community Member

‎03-29-2025 07:12 PM

My 3rd Generation Nest, about 8 years old, had a recent software update March of 2025.  As a result it is no longer powering the RSV valve on my heat pump to switch it to cooling.  I have reset and removed from my Nest products and then added back.  I thought it was the controller board ($100) so I replaced it and that did not correct it.  Put in a non programmable thermostat and all works fine.  Two different service tech immediately said it was my Nest and then recommended Ecobee.  I would really like to stay with Nest.  

So is it the software or did my thermostat really bite the dust?

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3 REPLIES 3

brothabman
Community Member

‎03-30-2025 01:41 PM

Hi - i think I am having a similar issue. When I put the system on cool mode it still blows hot air. I have another gen3 that also had the software update, but it works correctly when installed in that location.

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Neel480
Community Member

‎04-02-2025 05:06 PM

I'm having the same issue.

My 4 year old gen3 had operated my heat pump without issue until Monday. The first warm day of the season I asked it to cool and instead it blew hot air. I figured the reversing valve solenoid had gone bad.  It had also recently received the 6.3-5 software update. Techs confirmed today that it was no longer supplying the 24V output to the solenoid on the reversing valve.  Reinstalling the old dumb thermostat fixed the issue. 

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GabrielaG
Community Specialist
Community Specialist

‎04-03-2025 02:31 PM

Hi everyone,

 

Thanks for reaching out to the Google Nest community. I'm sorry to hear that your Nest Learning Thermostat 3rd gen is not sending a signal to turn on reversing the Solenoid Valve, but there's no need to worry; I'm happy to help you right now.

I appreciate the troubleshooting you have done with your Nest Learning Thermostat 3rd gen. To get a better understanding of the situation, please help me out by answering the following questions:

  • Is this the first time you’re calling for cooling this year? If yes, did the heating work without issues in the winter?
  • When did cooling last work?
  • Do you see a power error code on your thermostat?
  • Have you set up a temperature schedule for your thermostat?
  • Can you please send me a picture of the Nest Learning Thermostat 3rd gen?

Any additional details you can provide will be helpful.

 

Best regards,

Gabriela

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