Error E105- problem with O/B wire

[Quang2900]

• Error E105-your thermostat has detected a problem with O/B wire
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[David_K]

The E105 error means the thermostat has an overcurrent problem. I'd recommend checking the power going to your thermostat and the internal wiring as described below.

Troubleshoot Nest thermostat help codes - Google Nest Help

If the link doesn't take you directly to the right section, you're looking for the "Troubleshoot wiring" section.

[Jhonleanmel]

Hey folks,

@David_K, we appreciate your helpful response.

@Quang2900, I hope you've got the answer you're looking for. If you're still in need of any assistance, feel free to let us know.

Best,
Mel

[Jhonleanmel]

Hey there,

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

Thanks,
Mel

[Jhonleanmel]

Hi everyone, 

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 will be locking this in 24 hours.

Thanks,
Mel