Heat link dead, no lights, can’t reset

aoifebuckley100 — Sat, 05 Apr 2025 00:12:19 GMT

My nest third gen learning thermostat is showing a H71 error and there are no lights on the heat link and heating not working!

I don’t know how old the system is as I just bought the house with the nest installed.

i have tried a hard reset of the heat link but nothing happens. There is a second thermostat/heat link for the downstairs heating and water and this is working fine.

Re: Heat link dead, no lights, can’t reset

sicsacol — Mon, 07 Apr 2025 21:18:14 GMT

Hi @aoifebuckley100,

Thanks for reaching out to the community forum. I'm sorry to hear you're going through this with your Heat Link and your Nest thermostat. I understand that you have another Nest thermostat that's working fine. Don't worry, we'll work together to resolve this. To better assist you, I have a few questions:

How long has your Nest learning thermostat been installed for?
Have you had any power cuts recently?
Have you had any work done on your electrical or heating systems recently?
Have you checked that the wires are properly connected to the Heat Link?
When you press the Heat Link button, is there any light?
Please share a picture of the error message displayed on your Nest Learning Thermostat.

I really appreciate your troubleshooting efforts. Please let me know the answers to these questions, and I'll be happy to help you further.

Cheers,

Jonathan

topic Heat link dead, no lights, can’t reset in Nest Thermostats

Heat link dead, no lights, can’t reset

Re: Heat link dead, no lights, can’t reset