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Nest Heatlink completely dead.

andyferdean
Community Member

After 2 years of working great my Nest Heatlink is completely dead. I checked the heatlink to try to manually switch the heating on, but the heatlink is completely dead. I have an European version and I inserted a microusb power adapter and I got the lights to turn on but the heating does not turn on manually even this way. I also pushed the button 30 seconds, but nothing happens. It turns out that the heatlink does not receive any power from the 220V outlet. 

How can I get a heatlink replacement? The cold season is coming soon and I really want to fix this ASAP. Thank you!

 

Later edit: fixed with changing a diode which failed. An electrician checked it and it was busted. Changed it and now all is good. 

 

Here is the problematic diode: S3100

It's a PowerDI 3A with 100V diode.

https://photos.app.goo.gl/nLQcxUyrUaMN4NhH6

5 REPLIES 5

george_t
Community Specialist
Community Specialist

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

 

 

What type of Nest thermostat do you have?
Did the issue happen during installation or after installation? Was it installed by a Nest Pro or by a regular installer?
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?
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, has the power been restored?
Have you recently had service or maintenance on your electrical, plumbing, or heating system?
Have you tried any troubleshooting steps before contacting us?
How many thermostats do you have?

GeorgeT

The issue appeared after two years of working fine as I said in my post. It didn't appear after a powercut. Trying to activate it manually does not trigger heating. 

I already solved the issue. It seems that a certain diode has failed, which it turns out it's a common problem for the European version. 

I changed the diode and all is good now. I bought 5 diodes just to have some spares left and the parts + soldering at a local smartphone repair shop did not cost more than 10-12$.

Here is the problematic diode: S3100

It's a PowerDI 3A with 100V diode.

https://photos.app.goo.gl/nLQcxUyrUaMN4NhH6

george_t
Community Specialist
Community Specialist

Glad to hear everything is back on track. I will forward this information to my senior colleagues for review. Is there anything else I can help with?

GeorgeT

No, thank you! I learned that this is quite a common issue, this diode is problematic for many. 

george_t
Community Specialist
Community Specialist

Alright. In this case, I'll go ahead and lock this thread. Should anything else come up, please feel free to start a new thread and we'll be happy to help.

GeorgeT