My thermostat

[mountainhome]

The screen says It has detected a problem with the Y1 wire. Which is the heat and cool wire. In red it says E103. Any help appreciated on what to do. 

[sporfrog]

The Y1 wire is actually just for cooling. It appears that error code often indicates too much voltage on the wire. This could be a problem with the HVAC system rather than the thermostat.

If this is a new Nest installation verify the wiring to ensure it is correct. Compare to the photo of your old thermostat to ensure wires are labeled correctly and and connected to the correct terminal. Feel free to attach photos to a reply if you want a second pair of eyes looking.

Here is some troubleshooting information.

[MelbaDT]

Hey folks, 

Appreciate your answer and for providing the helpful link, sporfrog. 

@mountainhome, how's your Nest thermostat now? 

@Jacquanette3, sorry to hear that you're getting the same code on your thermostat's display? Have you had the chance to try the suggested step on the link provided by sporfrog above?

Best, 

Melba

[Jacquanette3]

I’ve followed all the troubleshooting steps. I’ve restarted the nest, undone the wires and redid them. Trimmed them back to expose a fresh connection. Charged the Nest. I’ve done it all. No change whatsoever. The until was installed by me in 2017 and have not had any issues with it. The AC unit (the whole system) was freshly installed in spring of 2017 as well. 

[MelbaDT]

Hi Jacquanette3, 

Gotcha — thanks for these added details. What's the specific message or code that you're getting on your Nest app or thermostat display?

Best, 

Melba

[Rsm8147]

Did you find out what the problem was? I’m having this issue now 

[Jacquanette3]

I’m having the same issue. Nothing has changed since I installed it in 2017. This is insane. 

[zschiffman]

having this issue today too. no issues for 2 years, first use of AC in 2022 today and getting error 103.

[o2baheel]

SAME exact scenario with mine!

[jshstvr]

Same situation with mine. Installed 2016, first time used this season I got the y1 error e103. Switched the wire to use an available one and got the same error.

[Rsm8147]

What was the issue? Having the same problem now.

[sporfrog]

Just out of curiosity did anyone have their HVAC unit checked? It is absolutely possible this could be the thermostat, but also possible it could be the HVAC unit - especially if this is the first time to use for the season. I am curious if the thermostat is indicating an issue with the AC or an issue with itself.

[golephish]

I have been saearching for this the past 2 days. I started getting e103 -- then it seemed it was short cycling the air. No blown fuse and no common wire in my case. 2 units both the same. My money is literally on the base, as I have ordered one that should arrive later today. 

[JorLein]

Did this fix the issue? I am running in to the exact same issue, I wonder if it is the NEST, No issue last year, tried to use the AC a week ago and I am getting the E103 error, new furnace installed today, same E103 error. 

[golephish]

in my case, it was the compressor. There was a short that caused the thermostats to tricle power which killed the compressor. Replaced by an awesome repair guy and now is working as expected.

[golephish]

I meant to say CONTACT not the compressor. It was not the base, and seamless plug the black looks really nice. According to the very good HVAC guy I used, there were indeed 2 shorts outside at the fan. This caused the nest to drain power.  I had originally attempted to disconnect the wire, which was working but ultimately when we replaced the contact ($300) it started working and has been working as expected. 

[JorLein]

Same issue I am having

[Ryan_G]

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