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Nest Thermostat 3rd Gen AC works for a little while then no air comes out of the vents - Fan running

ZugVader
Community Member

Installed it a few months ago during the winter.  During installation I switched it to cool briefly just to verify the compressor came on, and it did.  (Bryant single stage 113A)  Now, when I turn on the AC, it runs just fine for a certain amount of time, (15 mins?) then all of a sudden air is no longer coming from the vents.  Compressor is still running, and the fan on the furnace is screaming, and cold air is coming out near the top of the furnace.  My basement is now plenty cool, however, I really want that cold air upstairs. 😉  Current wiring and power readings attached.  I also tried switching the red wire to the RH and it did the same thing.  I have turned off EVERY learning, eco and away setting I could possibly find, still no good.  Brand new air filter as well.  This is maddening when it's 96 outside today.20220520_093525.jpg20220520_093041.jpg

1 ACCEPTED SOLUTION

ZugVader
Community Member

Hey all - thanks.  It absolutely wasn't the thermostat, just timing.  My line is freezing up.  After messing with the wiring for the 3rd time, I finally went downstairs and looked at the furnace and saw the line frosty right out of the  evaporator.  HVAC guy coming next week.  😉  

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6 REPLIES 6

Patrick_Caezza
Platinum Product Expert
Platinum Product Expert

When you set it to cool, the blower turns on, and the outdoor unit also turns on?

Does the outdoor unit stay on when it stops supplying cool air to the other floors?

It sounds like your system is staying on and supplying cool air but is being stopped by something in the ducting.

Do you have any type of vent controls, baffles, or humidifier/dehumidifier bypass installed?

Ryan_G
Community Specialist
Community Specialist

Hi ZugVader,

 

Thanks for reaching out here in the community.

 

I'd like to jump in here and check if you've seen Patrick_Caezza's response.

 

Thanks for your help, Patrick_Caezza.

 

Best regards,

Ryan

ZugVader
Community Member

Hey all - thanks.  It absolutely wasn't the thermostat, just timing.  My line is freezing up.  After messing with the wiring for the 3rd time, I finally went downstairs and looked at the furnace and saw the line frosty right out of the  evaporator.  HVAC guy coming next week.  😉  

Ryan_G
Community Specialist
Community Specialist

Hey ZugVader,

 

Thanks for the reply.

 

It's great to hear that you will have a technician coming out. I'll leave this thread open for the next couple of days and let us know if something come out. 

 

Best regards,

Ryan


 

Ryan_G
Community Specialist
Community Specialist

Hey ZugVader,

 

I just wanted to follow up and see if you're still in need of help. Please let us know as we would be happy to answer any questions you may have. 

 

Best regards,

Ryan


 

MelbaDT
Community Specialist
Community Specialist

Hi, 

 

We haven't heard from you in a while so we'll be locking this thread if there is no update within the day. If you have any new issues, updates or just a discussion topic, feel free to start a new thread in the community.

 

Best, 

Melba