Nest Thermostat has H71 error code and there are no lights on the heatlink.

[burks01]

Hi, I just had a H71 error code appear on my thermostat. Checked the heat link and the power is on to it, but the unit is dead. There are no lights on and nothing happens after holding the button for 20 seconds. I turned the power off and on again too and still nothing. Can I get a replacement?

[AnaM]

Hey @Huw,

I'm sorry to hear you're experiencing this issue, but we'll sort this out together. Let's start with a few questions:

1. What type of Nest thermostat do you have?
2. Did the issue happen during installation or after installation? Was it installed by a Nest Pro or by a regular installer?
3. Does the boiler activate when calling for heat by pressing the Heat Link's button to activate Manual Mode?
4. Are you seeing any wiring report or error on the thermostat and/or the app?
5. Have you had any recent power cuts in your area? If yes, has the power been restored?
6. Have you recently had service or maintenance on your electrical, plumbing, or heating system?
7. Have you tried any troubleshooting steps before contacting us?
8. How many thermostats do you have?

[AndaD]

Hi there again. I wanted to check how everything goes. Were the troubleshooting steps helpful? Don't hesitate to let me know if you need more help. 

[burks01]

Hi Andad, the trouble shooting steps didn't help at all unfortunately. The unit has completely stopped working.

[george_t]

Hi @burks01,

Thanks for the details. In order to further assist you, please answer the rest of the questions above, and then I can create a case for you.

[DragosC]

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

[burks01]

Hi Dragos. I did reply to the previous message but it seems to have gone now. I can confirm that I have tried all of the advise in the previous points but nothing is working. The receiver bit is just broken. Can you send a replacement?

[DragosC]

Understood. Thanks for letting me know. Could you fill out the template with the questions before? 

[burks01]

1. What type of Nest thermostat do you have? v2
2. Did the issue happen during installation or after installation? Was it installed by a Nest Pro or by a regular installer? Already installed when we moved in so I don't know.
3. Does the boiler activate when calling for heat by pressing the Heat Link's button to activate Manual Mode? No the heat link is not working at all.
4. Are you seeing any wiring report or error on the thermostat and/or the app? No just h71 code.
5. Have you had any recent power cuts in your area? If yes, has the power been restored? No power cuts.
6. Have you recently had service or maintenance on your electrical, plumbing, or heating system? No
7. Have you tried any troubleshooting steps before contacting us? Everything advised online.
8. How many thermostats do you have? 1

[DragosC]

Thank you. 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? 
 

[burks01]

Hi, yes I checked the fuses and they were all fine. I turned them off and on again and still nothing from the unit.

[DragosC]

Thank you. I've sent you an email with a form. Let me know when you've filled out please. 

[AndaD]

Hi there again,

I'm just following up on our last message. Did you manage to fill in the form? Let me know if you need any guidance. 

[burks01]

Hi, sorry I have just filled it out. Somehow that one email dropped into spam. It's filled out and been sent back now.

[DragosC]

Thank you very much. I've found the form and sent you an email. From now on, we'll keep this conversation there on the email. 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!