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E30 error but have no AC

Community Member

I have a 2nd Gen Nest, for several years. Just replaced a blown fuse in my heater, and it's now telling me I have an e30 error with no power to Y1. Seems to be referring to an air conditioner, but I only have a furnace, which until the error showed up was operating just fine. How do I dismiss the e30 error?


Platinum Product Expert
Platinum Product Expert

Did you find out what caused the fuse to blow?

Try doing a reset to factory default and set it up again. Power problems can cause issues with the thermostat's memory.

To ensure that I see your reply, please tag me using @Patrick_Caezza

Hey folks, 

@Patrick_Caezza, appreciate your helpful responses. 
@Tmagrino, chiming in to ensure everything is good here. Have you had the chance to try the suggestion above? If yes, how is it?


Hey everyone,

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.


No, I haven't been able to fix it. The furnace still seems to be running and turning on at the previously programmed times, but the thermostat itself won't let me out of the E30 screen. My app says the same thing re: power issue. The thermostat is still on a clearly charging, but is claiming it isn't getting power. Is there a way to do a manual factory reset? The kind that goes through Settings menus is locked away behind the E30 screen.

Community Specialist
Community Specialist

Hi Tmagrino,


Chiming in to see how I could help.


I appreciate you for following up @Jhonleanmel.


@Tmagrino, thanks for getting back, and I'm sorry if the issue still persists. Let's sort this out and try the steps here:


  1. On the E30 message screen.
    1. Go to Technical Info > Power. Check the status of the battery level, Voc, Vin, and Lin.
  2. Tap and hold the thermostat screen for 10 seconds to restart.
  3. Once rebooted, go to equipment settings. Check if the message code appears.
  4. Let us know to which terminals the wires are connected on its base and make sure all the wires are properly connected.


Have a look at this guide for additional troubleshoot and let us know how it goes.


Best regards,


Hi Tmagrino,


I'm checking back in. Were you able to do the steps above? I'd be glad to hear from you — I'd like to make sure everything is working.

Best regards,


Community Specialist
Community Specialist

Hi everyone,


@Tmagrino we haven’t heard any updates from you. I’ll go ahead and lock this thread in 24 hours. If you're still in need of assistance, feel free to start a new thread and we'll be happy to help.


I appreciate your response, @mark, @Patrick_Caezza and @mel.