🔄 Try this first — Press and hold the thermostat ring for about 10 seconds until the screen turns off, then release to restart it. Also check your boiler is switched on and your router is working.

Is your Nest Thermostat E not turning your heating on when it should? Here are the checks you can safely carry out before contacting support.

What This Problem Means

The thermostat is not successfully calling for heat from your boiler. This can be caused by a schedule or temperature setting, a connection issue between the thermostat and the boiler, or a boiler fault.

Common Symptoms

  • Heating does not come on at scheduled times
  • The thermostat shows it is calling for heat but no warmth is produced
  • The flame or heating symbol does not appear on the display when expected
  • Rooms remain cold despite the target temperature being set higher than the current temperature

Safe Checks You Can Try

1. Check the Temperature Setting

On the Nest Thermostat E, confirm the target temperature is set higher than the current room temperature. The heating only activates when the target is above the measured temperature. Turn the dial up and check whether the heating symbol appears.

2. Check the Heating Schedule

In the app, review your heating schedule. If the heating is set to a low temperature or off during the current period it will not heat. Check for any Eco or Away mode that may be active.

3. Check Your Boiler Is Switched On

Confirm your boiler is powered on and has not locked out. Check the boiler pressure gauge is in the normal range (usually 1-1.5 bar when cold). A boiler that has lost pressure or locked out will not respond.

4. Restart the Thermostat

Press and hold the thermostat ring for about 10 seconds until the screen turns off, then release to restart it. Allow it to restart fully, then test the heating again.

5. Check the Heat Link Connection

The Nest Thermostat E communicates with your boiler via the Heat Link unit. Check the Heat Link has power and that its light indicates a connection to the thermostat. If it shows no connection, the heating cannot be controlled.

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When To Contact Support

If you have worked through the checks above and the issue persists, contact Google Nest support at https://support.google.com/googlenest. For heating system faults that do not resolve, consult a qualified heating engineer — the Nest Thermostat E works with your existing boiler wiring and a heating professional can check the connections safely.

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