Vaillant Ambisense R920 unit/Ecotec Plus 831 installation problem

Discussion in 'Plumbing and Central Heating' started by SJRSJR, 29 Oct 2021.

  1. SJRSJR

    SJRSJR

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    Hello

    I bought a Vaillant Ambisense Starter pack (three TRVs and control unit) for my EcotecPlus boiler. I've connected the boiler's BUS terminals and the R920 controller's BUS terminals and , set up the Vaillant VRC700 app. There's an internet connection but when I open up the app I get 'Installation not compatible - no compatible control could be identified '. I've done the re-start etc but am getting nowhere.
    Any ideas? I used 2 of the 4 core heat resistant cable that was used by my previous Siemens RF controller, might that be the problem?

    Thanks
     
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  3. SJRSJR

    SJRSJR

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    I've swapped the cable for 0.75mm2 2core multi-strand but it's still not working. I've reversed polarity. I've deleted and reinstalled the app. Still the same message. Please help!
     
  4. SJRSJR

    SJRSJR

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    Hoping today's weather might mean a Vaillant/Ambisense expert abandons outdoor plans and goes online to rescue floundering diynotters... :)
     
  5. CBW

    CBW

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    Post a photo of wiring please, and any other controls.
     
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  6. SJRSJR

    SJRSJR

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    Hi Chris - there's a photo in my first post - the boiler's electric board, the controller's connection and the app message - can you see it? (It's there when I'm logged in but disappears when I'm not)
     
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  7. CBW

    CBW

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    Hi,

    No, I can’t see anything, it’s not on your profile media either.
     
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  8. Cal10

    Cal10

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    Have you also got a VRC700 controller plugged in somewhere?
     
  9. SJRSJR

    SJRSJR

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    No, nothing else. The starter pack just came with the TRVs and the R920 controller
     
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  11. SJRSJR

    SJRSJR

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    My media settings were set to 'owner only' so I've changed it to 'everyone'. Maybe that's the reason. It's in the Vaillant Ecotec Plus 831 boiler folder. Thanks
     
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  12. Cal10

    Cal10

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    That’ll be why it’s not working. You’ll need a VRC700 as well.
     
  13. CBW

    CBW

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    Setup seems ok, perhaps it actually isn’t compatible? Unless it’s as per @Cal10 and you need the additional controller?
     
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  14. Cal10

    Cal10

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    Yeah the Ambisense controls are meant to be used on conjunction with either a VRC700 or a sensocomfort hence the ‘no compatible control’ error.
     
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  15. SJRSJR

    SJRSJR

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    Ah ok. Shame Vaillant didn't tell me that when they advised me to buy the Starter pack, I thought including everything to needed to get started was the point of it! o_O Thank you for pointing me in the right direction!
     
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  16. Cal10

    Cal10

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    No worries - it’s really not very clear.
     
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