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H72 Heatlink

Community Member

Hi my Nest is showing the fault H72, I have checked the heatlink and have 240v there and it won’t let me reset either. I have 2 Nest thermostats on the same power circuit and the other one is working fine. This unit was only installed in Feb 21. Can someone please assist as I have a disabled wife who can’t get to cold.  


Community Specialist
Community Specialist

Hi there,

Thanks for reaching out. I'll do my best to get this sorted for you as soon as possible.

Here are some helpful troubleshooting steps:

Press the button on the Heat Link and check if you have any lights on it
Check if the circuit breakers and the switches are set to on
Turn them off and then back on
Press on the button again and check for LEDs

Could you also help me with some answers to these questions?

How long has your thermostat been installed for?
Did the issue happen during the installation?
Is there any error on the Nest thermostat display?
Have you had any power cuts recently?
Have you had any work done on your electrical or heating systems recently?
If yes, was the power properly restored at the fuse board after work was done?
How many zones ( thermostats ) are present in the setup?


Community Specialist
Community Specialist

Hi, I wanted to check in. Do you need any further assistance?


If so, make sure to let me know.

Community Specialist
Community Specialist

It's been a while since this thread was last updated so I'll go ahead and lock this thread. If you're still experiencing problems, please feel free to start a new thread and we'll be happy to help.