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Discuss Intergas boiler and Nest Thermostat in the Central Heating Forum area at UKPlumbersForums.co.uk.

  1. Pmorrison

    Pmorrison New Member

    Hi, hope this is the right place for this question.

    I've got an Intergas Combi Compact HRE 28/24 and have just had a Nest Pro installer in to put in the third generation thermostat.

    The Nest is wired into the boiler and there is no other thermostat but the boiler is ignoring it and just turning on regardless (basically it's just following the times program and turning on and off with the timing function).

    Are there any known problems with the compatibility? If there is anything I can try I'm willing to give it a go!!
     
  2. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Best to get the installer who fitted the nest back
     
  3. Pmorrison

    Pmorrison New Member

    The nest installer feels everything is done correctly (to be fair I think he has) but the boiler just overrides it. Hoping Intergas support may know what to do, have spoken to boiler installer who can't think what the problem can be either.
     
  4. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Your best bet would be, fire an email over to nest to see if the boiler is compatible
     
    • Like Like x 1
  5. Moffski72

    Moffski72 Moffski72 GSR

    You need to have the boiler display on 'C-ON', just press the clock button to get it into constant on (c-on) mode, and it will respond to the nest stat rather than the internal timed set up. Hope this helps
     
  6. Pmorrison

    Pmorrison New Member

    I called Intergas this morning and they confirmed my boiler was compatible with Nest and suggested the same (set it to c-on) but the boiler still ignores the Nest. I've opened up the boiler and this is a photo of the wiring, the nest is the black wire in '1' - is that the correct position?

    IMG_4241.JPG
     
  7. Pmorrison

    Pmorrison New Member

    This is the wiring diagram - should the Nest be in the low voltage side rather than the 230V?

    IMG_4242.JPG
     
  8. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    have you got a multi meter?

    and a pic of the nest wiring please
     
  9. Moffski72

    Moffski72 Moffski72 GSR

    Probably better to get your nest installer back to sort it rather than poking about in there. You've paid him for a service (to install the nest) and you should get him back. From that picture, it doesn't look quite right to me. Or contact a decent sparky. Either way you need someone qualified to sort it.
     
  10. Pmorrison

    Pmorrison New Member

    I don't have a multi meter no. Nest wiring below.

    IMG_4244.JPG
     
  11. Pmorrison

    Pmorrison New Member

    I've spoken to the chap who installed the boiler and hopefully he can pop round at the weekend, the nest installer seemed stumped by it and felt he had done everything right and that the boiler was the problem, difficult to say otherwise when you don't have the experience and they do!
     
  12. ggman

    ggman Member

    no, there is a problem, I can see an hearth cable connected to one open therm connection, I won't say no more I don't think an installer would have done this mistake.
     
  13. Pmorrison

    Pmorrison New Member

    The installer came from directly from the Nest installers page and his rating it pretty good. Is it something that can be sorted pretty easily? My boiler man wasn't able to get over this weekend so I'm still waiting to get it sorted.
     
  14. Pmorrison

    Pmorrison New Member

    I think it's just the angle of the photo that makes it look like there's an earth in the opentherm connection (assuming they are OT1 and OT2)?

    IMG_4273.JPG
     
  15. muggles

    muggles Member

    I'd definitely get that re-done - your boiler is OpenTherm compatible and yet he's tried to use the 230v on/off switching, rather than Nest's OT terminals. Looks like neither of them really understand either the boiler or the stat - OT is more efficient, and should be used as it's available at both ends.
     
    • Agree Agree x 1
  16. muggles

    muggles Member

    For clarity, wire in Nest L and N, do away with the link L to 2, and the connection in 3. Wire OT1 and OT2 to X4 11 & 12 on the boiler. They're polarity-free so you can't get it wrong
     
  17. CornBunting

    CornBunting New Member

    Hi all, I am trying to help my electrican setup my new intergas HRE OV boiler, and nest thermostat using OpenTherm link. The boiler is configured with S plan. So for the hot water I believe I need to use the relay contacts from the nest heat link? For the heating is its purely the two wires from the OT terminals and no relay contacts from the nest heat link? If it is just the OT terminals for the heating, how does the heating zone valve open and close? I’m sure I confusing myself the more I read, if anyone can help or has a simple wiring diagram showing the zone valves wiring along with OT control from the nest, it would be very much appreciated. Cheers
     
  18. Chuck

    Chuck Active Member

    So, you'll be wanting to start your own question rather than threadjack this one.
     
    • Like Like x 1
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