topic Re: My heat link has completely shut down, no lights and cannot restart. Any help?! in Nest Thermostats

My heat link has completely shut down, no lights and cannot restart. Any help?!

rgaila — Mon, 30 Aug 2021 14:42:47 GMT

Disclaimer: This thread was migrated from our previous version of the Google Nest Community. You can continue to receive updates on your thread issue here or simply ask, browse or more in the new Google Nest Community.

Original Poster: Pamela Kidd

My thermostat is saying error H71 cannot connect to heat source. The heat link is completely dead - no lights on it, no power, will not reset when I hold down the main button. I have tried switching off the power supply to the unit and then turning it on again but it has not restarted the heat link. Any advice or do I need to get an engineer in?

Re: My heat link has completely shut down, no lights and cannot restart. Any help?!

rgaila — Mon, 30 Aug 2021 14:43:38 GMT

Hi Pamela,

Thanks for reaching out. Let's check a few things:

What type of Nest thermostat do you have?
When was it installed?
Did the issue happen during installation or after installation?
Are there any lights on the Heat Link? Does the boiler activate when calling for heat by pressing 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, document the answer to the following questions.
How long ago was the latest power cut?
How often do these power cuts occur?
How long was the power off for? (Be specific.) Do you get an error after each power cut?
Has the thermostat been on since this power cut?
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.)
Have you tried any troubleshooting steps before contacting us?

Let me know so I can properly help you.

-From Andreaa C, Community Specialist.

Re: My heat link has completely shut down, no lights and cannot restart. Any help?!

Maisey60 — Fri, 19 Nov 2021 06:54:55 GMT

Snap. Same here. I’ve checked all I can. It’s was working fine, and just stopped!

Re: My heat link has completely shut down, no lights and cannot restart. Any help?!

babsbol — Thu, 02 Dec 2021 11:05:00 GMT

The same thing has happened to me. No light on the heat link, totally dead, and doesn't respond to holding down the button for 10 or 20 seconds. Can't turn on heat. Doesn't appear to be any reason for this. Engineers are all booked up and not taking urgent call outs. Is there anything I can do? Appears to be a second generation model.

Re: My heat link has completely shut down, no lights and cannot restart. Any help?!

CristianC — Wed, 19 Jan 2022 16:37:21 GMT

Hey everyone,

Sorry for the late reply. Did you manage to resolve the issue in the meantime? Let me know if I can help.

Re: My heat link has completely shut down, no lights and cannot restart. Any help?!

AnaM — Wed, 26 Jan 2022 15:41:39 GMT

Hello everyone,

Just checking once more if you need help. Let me know and I'll be happy to assist.

Re: My heat link has completely shut down, no lights and cannot restart. Any help?!

AlexD — Fri, 04 Feb 2022 10:37:10 GMT

Hey there, I haven't heard from you in a while so I'll be locking this thread. If you have any new issues, updates or just a discussion topic, feel free to start a new thread in the community. Thanks, AlexD.