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Heat pump reversing valve

sjohn64290
Community Member

My heat pump reversing valve will not switch to cool mode because there is no signal from my Nest 3 Learning Thermostat. Has anyone else run into this or a similar problem? Replacing the Nest thermostat with a standard thermostat resolved the problem. I also wondered if there could be a problem due to the latest software upgrade?

9 REPLIES 9

Ryan_G
Community Specialist
Community Specialist

Hi sjohn64290,

 

Thanks for reaching out and we're sorry for the delay.

 

Here's a few things to check for us to further isolate the issue:

  • Check the wire at the terminal. Make sure they are properly inserted. If possible, try to re-strip them to expose new copper wire.
  • Check your HVAC fuses.
  • Reverse the OB orientation by following the steps here.

Let us know how it goes.

 

Regards,

Ryan

Ryan_G
Community Specialist
Community Specialist

Hey sjohn64290,

 

I just wanted to follow up and see if you are still in need of help? Please let me know, as I would be happy to answer any questions you may have.

 

Best regards,

Ryan

Akkmem66
Community Member

I am having the same problem with my system and a Nest learning thermostat. My heat pump is less than a year old and the thermostat wire was replaced about a month ago.  My HVAC repairman thinks the thermostat is bad.  What should I do next?

We are having the same problem - reversing valve not sending signal from the Nest...when we turn on the AC, hot air comes out. Our repair person confirmed the problem is with the Nest --- we have two units and have nothing but problems with these units not to mention the service charges everytime something goes wrong with the Nest. 

dyoung75
Community Member

I am having the same issue. Two different thermostats were connected and had no issues, but my Nest is not sending power to the reversing valve to switch from Heat to A/C.

After calling Google/Nest and asking if the latest software update could be the culprit I was told to buy a new base plate to see if that would fix the problem. I tossed the Nest thermostat in the trash and have been much more satisfied with a Honeywell T4 thermostat.  In addition to the reversing valve now working properly the  heat/cool cycles are more responsive.  The system responds to changes in temperature requests more quickly and gently on the HVAC system vs the Nest which ran the system hard for extended periods of time. 

Ryan_G
Community Specialist
Community Specialist

Hey folks,

 

Thanks for visiting the Google Nest Community. 

 

Since this thread hasn't had activity in a while, we're going to close it to keep content fresh.

If you have additional questions, feel free to submit another post and provide as many details as possible so that others can lend a hand. 

 

Hope this helps!

 

Kind regards,

Ryan


 

cpabla
Community Member

Hello. I have had this exact issue twice. I have two units (1 for 2nd floor and 1 for 1st floor). About a 1.5 years ago, our HVAC tech said the issue is with Nest thermostat and they replaced with a new one (it was under warranty). Now, it happened again and this time with our 2nd thermostat and again it was Nest equipment issue so I had to buy a new one and replaced it and everything works again. If this happens again, I would never buy Nest thermostat (would just go with another vendor) and hope Google and Nest know about this and other consumers are aware to avoid Nest thermostat altogether.

Dwh2
Community Member

Is there away to change the t-stat to  energize the reverasing valve on cool like change it from b to o in the programing