Temp sensor unreliable connection

[Robb79]

I have a nest (not migrated) gen 2 thermostat. It has been working flawlessly for 5 years. I also had 3 temperature sensors connected to this thermostat for 3+ years. Just recently the temperature sensor I used to control the temperature started saying it had an unreliable connection to the thermostat. I noticed the heat or cooling was running past the set temperature as well. I tested the connection through the app and it tested good. I changed the battery and removed and reset the sensor. A week later same thing. I bought a brand new sensor, and moved that problematic sensor to a different room. The new sensor is now also showing as having an unreliable connection to the thermostat, while the problematic one I moved is perfect.

It has been in the same location for years, and is not the furthest from the thermostat.

The only thing we have changed is installing a new wifi lightbulb on the porch on the opposite side of the house, not in direct line of sight of the thermostat. None of the other rooms are having any issues with their sensors.

Anyone have any idea what could be causing this one room to all of a sudden have trouble connecting?

[Robb79]

Sorry, I have a 3rd generation, not 2nd generation

[Markjosephp]

Hello Robb79,

I'm sorry for the trouble this may have caused you, and I appreciate all the steps you've taken. I'd love to know more about this.

Since it has been isolated with a new sensor and by moving the first sensor to a different room. Network interference may have caused this issue. To isolate:

• Were there any electrical appliances or devices near the place where the sensors are installed?
• How far away is your sensor from your thermostat?
• Have you encountered any power issues with your thermostat?

Also, please give these steps a try:

1. Restart your thermostat and your router for at least 3 minutes to refresh their connections.
2. Check the thermostat's battery level. Go to its Settings > Technical Info > Power.

I'll look forward to your response.

Regards,

Mark

[Robb79]

Mark,

  Thanks for your response.  Here is my reply.

• Were there any electrical appliances or devices near the place where the sensors are installed? - Starting to think a smart bulb I installed may be faulty and causing interference, but confused as to why it would only affect this sensor, as there is another sensor closer to the bulb.  I'm testing this out now, but it takes some time for the sensor to show the unreliable connection warning.

• How far away is your sensor from your thermostat?  - ~35ft.  1 interior wall between it and thermostat.
• Have you encountered any power issues with your thermostat? - None that I am aware of.

     Restarted router and thermostat, might be a week before I see if the error recurs.  Battery level was 3.93V.  I will update if removing the bulb has worked, It may take a week to be sure.

[Markjosephp]

Hi there,

Thank you for informing me of this, and I look forward to hearing the outcome of your investigation. Please keep us posted on how it goes.

Regards,

Mark

[Markjosephp]

Hi Robb79,

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

Thanks,

Mark

[Robb79]

The lightbulb was not the culprit. I am testing a few more devices. 

1. A wireless access point.

2. A USB wall plug we installed recently in the same room as the sensor.

I hope to narrow it down to one of those. I will report back in a few days.

[Jenelyn_O]

Hi Robb79,

I saw your post and wanted to chime in. I'm sorry for the delay. I just want to confirm if you still need some assistance as I'll be willing to assist you from here. 

@Markjosephp I appreciate your help.

Best,

Jenelyn

[aatienza]

Hey there,

I just wanted to follow up to see if you still need our help. Please let us know as we would be happy to answer any questions you may have. 
 

I appreciate the help, everyone.

Thanks,

Archie

[aatienza]

Hello there,

Just checking in to make sure that you've seen our responses. Please let me know if you have other questions or concerns as I will be locking this in 24 hours if I won't hear back from you again. Feel free to start a new thread and we'll be happy to help.
 

Thanks,

Archie