🔄 Try this first — Press and hold the right-hand side of the thermostat display for about 10 seconds until it restarts. Also check your boiler is switched on and your router is working.

Is your Nest Thermostat (2020) 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 a higher target temperature

Safe Checks You Can Try

1. Check the Temperature Setting

On the Nest Thermostat (2020), confirm the target temperature is set higher than the current room temperature.

2. Check the Heating Schedule

In the app, review your heating schedule. 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).

4. Restart the Thermostat

Press and hold the right-hand side of the thermostat display for about 10 seconds until it restarts. Allow it to restart fully, then test the heating again.

5. Check the Heat Link Connection

The Nest Thermostat (2020) communicates with your boiler via the Heat Link unit. Check the Heat Link has power and that its light indicates a connection.

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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 (2020) works with your existing boiler wiring and a heating professional can check the connections safely.

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