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Troubleshoot when the Heat Link light is yellow

If your Heat Link and Google Nest thermostat lose their connection, the Heat Links status light will turn yellow. Your Nest thermostat won’t be able to control your heating until the connection is restored.

 

This article applies to the following Google Nest thermostats models in Europe that have the Heat Link:

Nest Thermostat E

Nest Thermostat E mounted on itNest Thermostat E Heat Link

Nest Learning Thermostat

Nest thermostat heating with silver ring3rd gen Heat Link

How to tell which thermostat you have

Select your Heat Link model for details.

Heat Link for Nest Thermostat E 

Status light Heating light What's happening

blink yellow

Blinking yellow

Off

Press the button on the Heat Link to check its status. Press a second time to turn manual heating on or off. A blinking yellow status light means something needs your attention. Check your thermostat display or the app for an error code or other message.

If you see a message on your thermostat that the Nest thermostat can't connect to Heat Link, press the button on the Heat Link to turn heating on manually. You may need to press the button twice until you see a steady green heating light gen 3 heat light green.

Learn about the lights on Heat Link and what they mean > 

Heat Link for 3rd gen Nest Learning Thermostat 

Status light Heating light Hot water light What's happening

nest thermostat yellow status light

Steady yellow

Off Off

Heat Link is disconnected from the thermostat and isn’t heating.

Press the button on Heat Link to turn heating and hot water on manually.

nest thermostat yellow status light

Steady yellow

nest thermostat green status light

Steady green

hot water light green

Steady green

Nest thermostat has disconnected from Heat Link and can’t control heating or hot water.

Heating and hot water was manually turned on after Heat Link’s button was pressed.

Press the button on Heat Link to turn heating and hot water off.

Learn about the lights on Heat Link and what they mean >

Heat Link for 2nd gen Nest Learning Thermostat 

Status Light Status What's happening

solid yellow light
Steady yellow

Not heating

Heat Link is disconnected from the thermostat and isn’t heating.

blink yellow
Blinking yellow

Heating (manual mode)

Heat Link is disconnected but is heating in manual mode.

blink green yellow
Blinking green and yellow

Searching for thermostat

Heat Link is actively searching and attempting to connect to the Nest thermostat.

Learn about the lights on Heat Link and what they mean >

If your thermostat becomes disconnected from the Heat Link, there will be a red circle on the thermostat with an error code and a message that the thermostat can't connect to Heat Link.

How to turn manual heating on or off when your Nest thermostat can’t connect to Heat Link >

H71 error message on thermostat

Reconnect Heat Link and Nest thermostat

Usually, your Nest thermostat and the Heat Link will reconnect on their own, even if your Wi-Fi is down, as they communicate over their own proprietary wireless network.

If it doesn’t reconnect on its own:

  1. Tap Try again on the thermostat.
  2. Check the message on your thermostat display. 
  3. Enter or search for the last part of the URL (for instance, H71 if you see nest.com/H71) to get detailed instructions at the article: Troubleshoot Nest thermostat error codes.

When they reconnect, the status light will turn solid green and the Nest thermostat will automatically return to controlling your heating and hot water according to its schedule. If the HeatLink is in Manual mode, you’ll see “Manual” on the Nest app home screen and on the thermostat.

How to turn manual heating off >

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