No power to Heat Links and thermostat error codes

[MCull]

I have been away from my house for 3 months. And heating has been turned off. When I went to restart heating, I see that there is no power going to my 2 heat links and my two nest thermostats are showimg h71 and h72 codes. I have turned on and off power but but no use. Any suggestions? I need to get the heating up and running ASAP! 

[DragosC]

 Thanks for letting us know @MCull

Could you tell me please when did the situation start occurring first and when was the thermostat installed? 

Also, please answer the following questions:

Are there any lights on the Heat Link? Does the boiler activate when calling for heat by pressing the Heat Link's button to activate Manual Mode?
Are you seeing any wiring report or error on the thermostat and/or the app?
Have you had any recent power cuts in your area? If yes, has the power been restored?
Have you recently had service or maintenance on your electrical, plumbing, or heating system?
If yes, how long was the power off for? (Be specific.)

Could you tell us please if you've checked on the breaker switch and fuse box?
Any blown fuse in there? Have you tried to turn the breaker switch off and on again? Any difference?

[MCull]

Thanks for getting back to me. Problem solved. Engineer that surveyed the house recently had cut the power to the heat link. All sorted now. Cheers

[DragosC]

Understood. Thanks for letting me know. We're glad it's been sorted out. In this case, I'll have to close this thread. Should anything else come up, please open another thread and we'll take it from there. Have a good one and stay safe!