Your Thermostat cannot control this equipment properly without wiring changes

[JDS6147]

Yesterday my thermostat displayed this message after what we think was a power flicker. “Your Thermostat cannot control this equipment properly without wiring changes.” The heat pump would not run during this time. Looking at the history in the App, it looks like it was off for several hours. It started working on its own and is fine now. I wasn’t home but my wife was. The clocks on the stove and microwave were flashing so that’s why we think the power flickered. My app just said error during that time so I couldn’t do anything remotely. I installed the thermostat 10 days ago. Is there a remedy for this? 

[GillesC]

I have the same problem. Been using the nest for 2 years now, never had any problems, suddenly this error message pops up. It is as it was due to a software update ...

[Markjosephp]

Hi folks,

Thanks for posting to the Google Nest Community forum.

@JDS6147, I'm sorry for the late reply. I wanted to ensure we were good to go. How's your Nest thermostat? Are you still having the same issue of not getting any power? Let us know so we can assist you right away.

@GillesC, we don't want you to have this kind of experience using your Nest thermostat. Let's see what's going on.

A few questions: what type of Nest thermostat do you have? Also, what's the exact message code or wiring report you're getting? I did find a helpful article with some troubleshooting steps that may help your device.

Please let me know if that helps, or if the issue still persists.

Thanks,

Mark

[GillesC]

Hi Mark,

I guess the problem was that the nest automagically wanted to connect wirelessly to the heatlink, while previously only the wired connection was used. I manually selected not to use the wireless option. I'll let you know if the error persists. If you do not hear from me, then the issue was probably resolved ;).

[Sumanth]

All of sudden I am getting this error, what might have Cassie’s this, mine is working completely fine for 5 years with out any issue

[Sumanth]

Hi, all of sudden my nest thermostats displaying this message, how did you resolve the issue 

[Telm]

Hi I’m getting the same message had it around three months working fine then yesterday just getting a message, your thermostat cannot control your equipment properly.

having to switch the heating on and off at the boiler 

Terry

[LC4261]

Hi. I am having this issue after our nest has worked fine for 2 years. “Your thermostat cannot control this equipment properly without wiring changes.” Any recommendations??

[chasiti]

I am having this issues as well. Has there not been a resolve yet?

[jrawl]

Having the same issue. Started around 2 weeks ago. Is there a reason google hasn't followed up with these publicly? Had a power outage, when it came back on, the thermostat was giving that error. Wanted to upgrade to a V3 of the thermostat from my V2. Did that and the issue resolved, until last night, when it happened again. There was no power outage last night. Was there an update that was pushed through in the last few weeks? Is this something that happens commonly during power outages? Would like some guidance. 

[Sumanth]

Any recommendations for this kind of error, all of sudden my nest thermostat started displaying this message after 5 years of successful run 

[GillesC]

Hi all,

(MY) SOLUTION:

I guess the problem was that the nest automagically wanted to connect wirelessly to the heatlink, while previously only the wired connection was used. I manually selected not to use the wireless option. This seemed to resolve the issue for me.

[rjonst]

I cut off the internet access over a month ago and this message just popped up.  I moved to the equipment window and did nothing except  click "Done".   The heating system is still functioning (the way I want it to.)

[dolfnphile]

I just had my Nest reinstalled after a home renovation and was receiving the E78 error. Turns out the HVAC guys mounted it using screws with rounded heads. The rounded heads prevented the Nest from fully connecting together. They also prevented one of the wires from fully engaging. Swapped out the screws and the problem was instantly resolved. I hope this helps.