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Andrew Smith
Andrew Smith, Engineer
Category: UK Plumbing
Satisfied Customers: 3591
Experience:  Domestic Gas, Commercial Gas, LPG, Unvented Hot Water, Part P Electrical, Commercial Catering
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I'm trying to fit a Nest Heat link (second gen Nest) to a

Customer Question

Customer: Hi ***** *****, I'm trying to fit a Nest Heat link (second gen Nest) to a Vaillant Ecotec plus 831 boiler (2nd gen)
JA: Thanks. Can you give me any more details about your issue?
Customer: The Ecotec plus 831 has two PCB revisions - and most guides pertain to the first one. I've posted this on the Nest community (https://community.nest.com/thread/11758) but I don't quite understand the (French) person's response. I'm clear that I have to remove the 24V RT loop (as the Nest Heatlink isn't 24V) But the boiler won't fire when I do that, even though I believe I've wired Live and Neutral etc up correctly. But the fact that it won't work (the heatlink will click just like a thermostat - but the boiler won't respond) suggests otherwise.
JA: OK got it. Last thing — JustAnswer charges a fee (generally around $18) to post your type of question to UK Plumbing Experts (you only pay if satisfied). There are a couple customers ahead of you. Are you willing to wait a bit?
Customer: You'll bill me in GBP, though (or Paypal?)
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Submitted: 11 months ago.
Category: UK Plumbing
Expert:  Andrew Smith replied 11 months ago.

did you get an answer?

The nest receiver will make and break a contact just like a standard 0v thermostat.

You just need a pair from the 24v contacts you have removed the loop from and take them to the stat.

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