Nest 3rd Gen is not running a Brand new Bryant Legacy package unit correctly

[Carlos2]

Hi,

We just replaced a 34 y old package unit with a brand new Bryant Legacy unit. It's an Ultra Low NOx unit (577C model) in California. The Nest thermostat was already in place for the last 2+ years running the old unit perfectly. Now the Nest cannot run the new unit correctly. It keeps the fan running all the time, even when I turn it off. The only time the fan stops running is when I remove the Nest from the base. The unit will even turn on as soon as I put the Nest back on the plate, even if the setting is "off" - please help. I love the Nest and I am hoping it's just an obscure setting that will allow me to continue to run this brand new unit with the Nest. Some additional info... Nest Model: Display-3.4; Serial # 09AB01AC02190890; Software: 6.2-27

Thanks in advance for any help.

Carlos

[Jenelyn_O]

Hi Carlos2,

Thanks for reaching out — I'm sorry for the delay. Do you have a C wire? If yes, try to remove it and check if the issue persists. It might be an issue with power sharing. Do you see any messages or code in the app or on the Nest Thermostat? 

Best,

Jenelyn

[Jenelyn_O]

Hi there,

I wanted to follow up if you still need help. Please let me know if you're still having any concerns or questions from here, as I would be happy to take a closer look and assist you further.

Thanks,

Jenelyn

[Jenelyn_O]

Hello Carlos2,

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'll be locking this thread in 24 hours.

Regards,

Jenelyn

[Carlos2]

Hi,

I was out of the country for a couple of weeks. I am back now and can work on this. Below is a link to the pic of the wiring of the Nest thermostat - there is no C wire. I removed the Nest and installed a super basic Thermostat (can't even program temps) because with the Nest the fan never shut off. Even if I actually turned the Thermostat off.  Let me know if there are any wiring combinations I can try. I am also attaching links to the pic of the Spec card for the Bryant unit and the pic of the wiring of the "basic" thermostat I had to install.

Thanks for the support,

Carlos

Pic of Nest Thermostat wiring 

Pic of Bryant Unit spec card 

Pic of Basic Thermostat wiring 

[zoeuvre]

Hello there,

@Carlos2, thanks for posting here in Community, and I'm sorry for the late reply. I tried to view the photos you linked above, but it is not allowing me to do so from here. Can you directly post the photos you are sharing with us?

Thanks for the help here, Jenelyn.

I'll look forward to your response.

Best, 

Zoe

[Carlos2]

Hi - we called a different HVAC company and it appears is not thermostat related. They are investigating the issue with the unit itself since the problem is now happening even with the different (basic) thermostat. I will comeback to this post once I have full resolution from HVAC company.

[Markjosephp]

Hello Carlos2,

I appreciate you updating us on your efforts in reaching out to an HVAC technician and diagnosing what could be the issue. Please keep us posted on how it went, as we would be glad to know what the result would be.

Regards,

Mark

[Jake]

Hey Carlos2,

I wanted to check in and see if you were able to get a HVAC pro. Please let me know, as I want to ensure you are good to go.

Best regards,
Jake

[Jake]

Hey there,

I wanted to check in, and let you know that I will be locking the thread in 24 hours.

Best regards,

Jake