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Heat Link manual mode turns itself on without pressing button!

Community Member

I've had my nest 3rd gen thermostat for three years without any problem. Recently I've noticed that the heating has been coming on even though the thermostat said it shouldn't be (the screen was black and the temp was turned down).

I looked in the boiler cupboard and noticed that the heating light and hot water light were both green which I found meant the nest was in manual mode. The instructions say that these lights only come on if the button on the Heat Link has been pressed. Initially, I thought that someone must have pressed the button accidentally but this has happened when no one had been in the house and we don't have any pets so I can't understand what's going on.

I contacted the nest online chat and they told me that they've never had this problem before and that this is impossible and it can only be activated by pressing the button. So I put a plastic box over the Heat Link so that it would be impossible to press the button and it still happens every few days! 

Has anyone else experienced this problem! Thanks.


Community Member

Yes I have the same problem. Every few days the display says it’s in manual mode. Problem started 3 weeks ago, I have to keep switching back to automatic.

Community Specialist
Community Specialist

Hi there all, thanks for letting me know.


Please try the steps below and let me know how it went:


1. Go to the actual thermostat:
     -Go into "Settings" => Go into "Nest Sense" => Turn off "Auto-Schedule" feature => Turn off " True Radiant" option => Turn on "Sunblock" feature.
     -Go into "Settings" => Go to Home/Away assist => Turn off the Home/Away assist feature for both heating and hot water(hot water option will be available only if you have a system boiler with a separate hot water tank)
2. Go into the mobile Nest App:
     -On the main screen, not on the thermostat's screen in the app,  access "Settings" => Home/Away assist => What decides if you're home => Turn off the phone's location and the product's motion sensor. Make sure all the settings are set to "No"
3. Clear all the schedule:
     -Go into the Nest App => Thermostat's screen => Schedule => Clear all the red setpoints, make sure the schedule's screen is blank, without any setpoint.
4. Restart the thermostat accessing the actual thermostat's "Settings" => Reset => Restart
5. Set a manual setpoint whenever you want for 29 degrees ( or any temperature that will make sure the thermostat start),  then another setpoint for after an hour for 9 degrees ( or any lower temperature that will make sure the thermostat stops from working).
6. The thermostat should follow the manual schedule accurately now. 

Community Specialist
Community Specialist

Hi there, just checking in with you. Did you manage to check the above message? Keep me posted!

Community Specialist
Community Specialist

Hey there, I haven't heard from you in a while so I'll be locking this thread. If you have any new issues, updates or just a discussion topic, feel free to start a new thread in the community. Thanks, AlexD.