Nest Heat Link - No power

[Abalam]

Hi, this morning woke up with a cold house and H71 error. No Power to the HeatLink. Boiler working fine. 

Please find below answers to the questions:

• Does anything happen if you press its button for 30 seconds?  NO
• In some cases the boiler will have an additional isolation switch which can turn off the power to both the Heat Link and the boiler. Can you try switching that off/on again to see if anything changes? NO CHANGE
• Make sure the breakers are on or the fuse board hasn't tripped. Breakers ON, No Fuse Tripped

Moreover, to have a better view over each of your cases, please help us with some answers:

1. How often do you experience the issue? First time this morning
2. How long has your thermostat been installed for? 24 months
3. What colour is the Heat Link LED? No LED Lit
4. What is showing on the Nest thermostat display? H71 error
5. Have you had any power cuts recently? No
6. Have you had any work done on your electrical or heating systems recently? No
7. How many zones are present in the setup? One
8. Is there power present to your boiler? YES

Additionnaly i can power on the thermostat with the USB power supply, it is successfully synced with the Nest LCD regulator: 

BUT: without the 220v input working, the Heat Link cannot switch on/off the boiler connection, even with a manual click on the button.

If it is not fixable, how can i replace only the heat link part ?
Thank you for your help

[Frustratedddd]

I take it they were the answers to the questions Nest asked you, sounds normal?

Should that be the case I am surprised they never passed you over to the senior bod.

I would ring again, and say you have had the circuit tested by an electrician and they have confirmed power to the Heat Link, but still no sign of life or lights on the Heat Link.

I sell Heat Links on ebay, just sold 6 this weekend. Nest will not sell any parts, which is a bit of a farce! See how you go, and if no luck I might be able to help.

Keep contacting them for a replacement.

[CristianC]

Hi @Abalam,

Thanks for reaching out. Good job with the troubleshooting steps. Please fill out this form so I can gather your details securely and let me know once you've done it: https://bit.ly/3oVDg4g. Please include the serial number of the thermostat, your full shipping address and the email address linked to your Nest account.

Regards,
Cristian

[CristianC]

Hello again. Just checking in. How's it going with your Heat Link?

[Abalam]

Chat support said 3 weeks ago that i would receive a new one, but i do not have any news since 3 weeks...

[CristianC]

Oh no. I'd love to look into it for you. Do you have a case number for your interaction with Google Nest support? 

[CristianC]

Hello again. Just checking in. Do you still need my help?

[CristianC]

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.