C-wire connected but thermostat says no c-wire

[Divimon2000]

I have the inexpensive unit - gen1 I think 1.4 (two of them) tied to my gas boiler. They blew through batteries until I ran a c-wire to them from an existing 24v transformer. They both worked fine and indicated the c-wire was connected. 24v was present. 3 days later one thermostat battery was getting low and the thermostat now indicated “no c-wire” !  I tested power and there was 24 v at thermostat. In addition, I swapped units and the “no c-wire” unit continued to display no c-wire even in the location where the other unit worked fine. Sounds like the unit is bad?

thanks

[Jhonleanmel]

Hi Divimon2000,

Thanks for posting.

I suggest restarting the thermostat having this issue. Check this guide to know more. After restarting the thermostat, let me know if you're still having the same message.

Best,

Mel

[Divimon2000]

Thanks Mel, I did restart and add fresh batteries. The unit now shows c-wire connected. Just wish I could understand how that could happen. (Born too curious, I guess). I’m watching battery voltage like a hawk now.  

[Jake]

Hey there,

I am glad to hear everything is working properly. There is a chance maybe the wire was not fully inserted into the device, and that could be the reason it was not showing. I would recommend double-checking that to ensure. Please let me know if you have any questions or trouble from here, as I would be happy to review.

Best regards,

Jake

[Markjosephp]

Hello Divimon2000,

I'm checking back in — how's it going with your Nest Thermostat? Still need our help? Please let us know so we can assist you right away.
 

Thanks,

Mark

[Markjosephp]

Hi Divimon2000,

It has been a few days since your last reply, and we're going to lock the thread within 24 hours. If you have any questions, please feel free to create a new post.

Thanks,

Mark

[Divimon2000]

Still working! Close thread. 

[EdwardT]

Hi Divimon2000,

Thanks for the update. I will be locking this thread now. Please feel free to create a new thread should you have some more questions or concerns in the near future and we'll be more than glad to help.

Thanks,

Edward