Device malfunction(Nest thermo 3rd gen.)

[tonyan66]

model : Nest Thermostat Learning 3rd Gen.

there are several symptoms, one is that the air blower suddenly works (even heater and cooler are not working). The display of the thermostat is showed off. The symptom disappears only when the main switch is turned off. Another symptom is that the air blower operation does not stop even if the thermostat is turned off while the heater is running. It does not stop even after more than 20 minutes. Thermo display shows "off" so I should turn off the main switch. A technician checked cables, resister, control boards, etc., and diagnosed a problem with the thermostat. When this error occurred again, I disconnected the thermostat(detach the thermo from the base plate) and the air blower stopped working. The problem is that these errors don't happen every time, they happen suddenly every 2-3 weeks. I hope this statement will help you, thanks.

[Ryan_G]

Hi tonyan66,

Thanks for being here in the Google Nest Community.

We're sorry to hear about what's happening with your Nest Learning Thermostat. I'd like to further check what's going on by looking at the current wiring configurations on your Nest Thermostat.

Also, what are the steps you've tried so far? We could check the temperature schedule as it can be a factor to this behavior.

Regards,

Ryan

[Ryan_G]

Hey folks,

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
 

[Ryan_G]

Hey there,

Thanks for being here in the Google Nest Community. 

I'd like to bump in here and make sure that you’ve seen our response.
Please let us know if you have any other questions or concerns as I will be locking this thread in 24 hours.

Have a great day.

Best regards,
Ryan