Nest thermostats - error message

[JC1]

Hi, error message is coming up on Nest thermostat. Error is H72. 
Nest is also not coming on at all and when it does it displays the error message.

Advice/help needed

thanks 

[Sebnestuser]

An H72 error message says 'The power to this thermostat is off'. Note that this error can take a few minutes to appear after power has been cut, so you may not see it immediately. 1. Check the thermostat power cable, plug and power socket.

[JC1]

Thanks for the advice. I’ve checked the above and still not working. I’ve read the advice on the Neat app as well.