# \[App\]\[Pro\] Viessmann App for Homey Pro

**URL:** <https://community.homey.app/t/app-pro-viessmann-app-for-homey-pro/116744>\
**Category:** Apps\
**Tags:** app, homey-pro\
**Created:** [September 26, 2024, 12:33pm UTC](https://community.homey.app/t/app-pro-viessmann-app-for-homey-pro/116744 "2024-09-26T12:33:22Z")\
**Posts on this page:** 1\
**Showing post:** 315

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**Author:** ![KennyMoens](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/kennymoens/32/84061_2.png) [@KennyMoens](https://community.homey.app/u/KennyMoens)\
**Post date:** [March 13, 2026, 1:23pm UTC](https://community.homey.app/t/app-pro-viessmann-app-for-homey-pro/116744/315 "2026-03-13T13:23:16Z")

</div>

Hello all,

I’ve been digging on the Viessmann forums and it seems a global issue with every integration with the Viessmann API.

Viesmann has removed write access to the API, without communication. We don’t know if it is a bug or an intentional move. They did not communicate at all on it.

Here are some topics (in German), on the Viessmann community forum:

- [The Viessmann API | Viessmann](https://community.viessmann.de/t5/The-Viessmann-API/bd-p/dev-viessmann-api)
- [Viessmann Climate Solutions Community - Viessmann Climate Solutions Community](https://community.viessmann.de/t5/The-Viessmann-API/kann-die-ViCare-sollwerte-nicht-mehr-ueber-API-setzten/td-p/604652/page/2)

Unfortunately there is not a lot I can do at this moment. This will apply to all integrations of the Viessmann API, and also for the other ViCare integration in Homey.

@Doekse , maybe something Homey itself can help out on and try to get some info from Viessmann?

Kind regards,

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