Nest Heat Link not working and not sending power to Thermostat

[scunny]

Good Day,

My thermostat and heating system suddenly stopped working two days ago Monday 4th April. Code H72.

The thermostat is fitted correctly and working for almost 3 year with no problems.

An electrician has checked the heat link, there is power getting to the heat link but no charge to the thermostat.

Pressing the heat link for 10 or 20 seconds does nothing.

There have been no power cuts and no circuits have tripped.

Trust you can advise next course of action as i have no way to turn my central heating on.

Many Thanks,

Brian

[AnaM]

Hey @scunny,

I'm sorry to hear about this situation, but I'll help you sort it out. Can you answer the questions below?

1. What type of Nest thermostat do you have?
2. When was it installed?
3. Did the issue happen during installation or after installation? Was it installed by a Nest Pro or by a regular installer?
4. 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?
5. How many thermostats do you have?
6. Have you had any recent power cuts in your area? If yes, has the power been restored?
7. Have you recently had service or maintenance on your electrical, plumbing, or heating system?
8. Have you tried any troubleshooting steps before contacting us?
    

[scunny]

1. Learning

2. 2 years and 4 month ago

3no

4. no

5. 1

6. no

7. no

8. Yes

[DragosC]

Thanks for letting us know, @scunny. 

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?

[scunny]

No circuit breaker issues, I’ve had an electrician round to look at it. As I said on my first post, there is power getting to the heat link but no charge / link to the thermostat.

[DragosC]

Understood. Thank you. I've sent you an email, @scunny. Please take a look at it and reply when you've done the required steps. 

[DragosC]

Hi there. I'm just following up on our last message. Do you still need our help? Keep us posted. 
 

[george_t]

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.