# \[App\]\[Pro\] Viessmann App for Homey Pro **URL:** \ **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:** 20\ **Page:** 16
**Author:** ![Essquare](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/essquare/32/121247_2.png) [@Essquare](https://community.homey.app/u/Essquare)\ **Post date:** [February 1, 2026, 12:48pm UTC](https://community.homey.app/t/app-pro-viessmann-app-for-homey-pro/116744/306 "2026-02-01T12:48:28Z")
Hi , I have a feature request. I’m using an older type viessmann Vitodens (300W WB3C) with the opto2 module, and a lot of datapoints are not supported (gas use, pressure etc), mostly data points in heating.gas.consumption. Is it possible to automatically hide data points if they are not reported as supported? I would like to also have the solar boiler data included. These data points are: 1. **Collector Temperature:** `heating.solar.sensors.temperature.collector` (Property: `value`) 2. **Solar DHW Temperature:** `heating.solar.sensors.temperature.dhw` (Property: `value`) 3. **Total Solar Yield:** `heating.solar.power.cumulativeProduced` (Property: `value` in `kilowattHour`) 4. **Solar Pump Status:** `heating.solar.pumps.circuit` (Property: `status`) 5. **Solar Recharge Suppression:** `heating.solar.rechargeSuppression` (Property: `status`) Thanks for looking into this! ---
**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:** [February 3, 2026, 6:44am UTC](https://community.homey.app/t/app-pro-viessmann-app-for-homey-pro/116744/307 "2026-02-03T06:44:15Z")
Hey Essquare, I’ll see what I can do to hide data points which are not supported by the device. I’ve added [issue #52](https://gitlab.com/functor-solutions/homey/viessmann/-/issues/52) in the backlog for this. The solar boiler data is that from your VItodens, or is that a separate device? If so, how is that one called? I’ve created [issue #53](https://gitlab.com/functor-solutions/homey/viessmann/-/issues/53) for this. ---
**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:** [February 6, 2026, 12:17pm UTC](https://community.homey.app/t/app-pro-viessmann-app-for-homey-pro/116744/308 "2026-02-06T12:17:51Z")
Hey @Essquare I’ve pushed a test version (v1.6.0) which should include your changes, can you check how it responds? You can install from : [Viessmann | Homey](https://homey.app/a/be.functor.viessmann/test/) Kind regards, ---
**Author:** ![Frank\_van\_leeuwen](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/frank_van_leeuwen/32/47643_2.png) [@Frank\_van\_leeuwen](https://community.homey.app/u/Frank_van_leeuwen)\ **Post date:** [February 7, 2026, 9:53am UTC](https://community.homey.app/t/app-pro-viessmann-app-for-homey-pro/116744/309 "2026-02-07T09:53:47Z")
Is there any chance to get the solar pv data from the vitocal heatpump? Greetings Frank. ---
**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:** [February 9, 2026, 6:35am UTC](https://community.homey.app/t/app-pro-viessmann-app-for-homey-pro/116744/310 "2026-02-09T06:35:40Z")
Hey @Frank_van_leeuwen Probably yes - do you have any idea which data points you would like to have exposed? You can view all of them here: [Viessmann Documentation](https://api.viessmann-climatesolutions.com/documentation/data-points) A features.json from your system (available from the option) can be additional help in implementing this. Kind regards, ---
**Author:** ![Essquare](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/essquare/32/121247_2.png) [@Essquare](https://community.homey.app/u/Essquare)\ **Post date:** [February 22, 2026, 12:30pm UTC](https://community.homey.app/t/app-pro-viessmann-app-for-homey-pro/116744/311 "2026-02-22T12:30:25Z")
Hey Kenny, I don’t know if you got my feedback through the bugreport system but solar data is working for me now. Gas use (unsupported for my Viessmann) is also hidden. Thank you! ---
**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:** [February 23, 2026, 5:55am UTC](https://community.homey.app/t/app-pro-viessmann-app-for-homey-pro/116744/312 "2026-02-23T05:55:37Z")
Great to hear! ---
**Author:** ![Radoslaw\_Faruga](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/radoslaw_faruga/32/120854_2.png) [@Radoslaw\_Faruga](https://community.homey.app/u/Radoslaw_Faruga)\ **Post date:** [March 13, 2026, 3:53am UTC](https://community.homey.app/t/app-pro-viessmann-app-for-homey-pro/116744/313 "2026-03-13T03:53:17Z")
Hi, Today I noticed that my gas boiler stopped responding to commands from Homey. My Flows also stopped working. It seems this happened sometime during the day. I tried: - reinstalling the app - removing and adding the devices again - generating a new Client ID Unfortunately, nothing helped. The device is added correctly in Homey and all parameters are visible. Also, changes made in the ViCare app are reflected in Homey after a short delay, so read access seems to work correctly. The problem is with write access: - changing the operating mode in Homey does nothing - changing the target temperature also does nothing - after a short while, the value in Homey reverts to the value currently set in ViCare Additionally, the mode labels now seem wrong. Homey currently shows: - Automatic - Heating - Cooling - Off Previously, it showed: - Hot water only - Heating and hot water - Off So it looks like Homey can read values, but cannot write changes, and the operating mode mapping may also be incorrect. Thanks. ---
**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, 6:30am UTC](https://community.homey.app/t/app-pro-viessmann-app-for-homey-pro/116744/314 "2026-03-13T06:30:54Z")
Hey @Radoslaw_Faruga I don’t know what has changed, but I suffer from the same. Judging from my debugging it appears all commands which could be send are disabled right now. It somehow appears that we have a read-only api now. As there are no changes documented in the API, I really wonder what is going on. Is this an error on Viessmann side? Is this something that changed that they didn’t document? For now, I’m without clues, but I’m assuming everyone has these issues right now. ---
**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")
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, ---
**Author:** ![Doekse](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/doekse/32/109415_2.png) [@Doekse](https://community.homey.app/u/Doekse)\ **Post date:** [March 13, 2026, 1:39pm UTC](https://community.homey.app/t/app-pro-viessmann-app-for-homey-pro/116744/316 "2026-03-13T13:39:52Z")
Thanks for the heads-up. We’re also trying to get in touch with the Viessmann team, although they’ve been fairly difficult to engage with in the past. ---
**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, 6:15pm UTC](https://community.homey.app/t/app-pro-viessmann-app-for-homey-pro/116744/317 "2026-03-13T18:15:34Z")
The problem should be resolved at least it is for me. Hopefully for everyone. ---
**Author:** ![Jerome\_CAPPELLE](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/jerome_cappelle/32/120849_2.png) [@Jerome\_CAPPELLE](https://community.homey.app/u/Jerome_CAPPELLE)\ **Post date:** [March 18, 2026, 9:29am UTC](https://community.homey.app/t/app-pro-viessmann-app-for-homey-pro/116744/318 "2026-03-18T09:29:50Z")
Hello Kenny, You made a remarkable job! I have a Vitocal 205. Would it be possible to command the leave/holiday mode from your app? Many thanks! Regards, Jérôme ---
**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 20, 2026, 2:30pm UTC](https://community.homey.app/t/app-pro-viessmann-app-for-homey-pro/116744/319 "2026-03-20T14:30:07Z")
Hey, There is an option inside the API to control the holiday mode, I did not expose this yet, as I do think it is worthwhile to configure this by means of Homey instead. I personally don’t rely on the programs of Viessmann itself anymore. Any reason why you want to use those programs explicitly? Kind regards, ---
**Author:** ![Thomas\_Brenac](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/thomas_brenac/32/121365_2.png) [@Thomas\_Brenac](https://community.homey.app/u/Thomas_Brenac)\ **Post date:** [April 4, 2026, 9:24pm UTC](https://community.homey.app/t/app-pro-viessmann-app-for-homey-pro/116744/320 "2026-04-04T21:24:58Z")
hi there, I wonder why I cannot connect at all. I have always the below pop up. any idea ? fair enough I’m new to homey but got 2 hands normally. Thank you in advance for your input. ![Screenshot 2026-04-04 at 23.21.17](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/0/3/038043a0f798fe5a66cb92463cc072aa38fe8697.png) ---
**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:** [April 5, 2026, 11:25am UTC](https://community.homey.app/t/app-pro-viessmann-app-for-homey-pro/116744/321 "2026-04-05T11:25:14Z")
Could you send me a diagnostics report as soon as the error appears? ---
**Author:** ![Blooddrunk](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/blooddrunk/32/82094_2.png) [@Blooddrunk](https://community.homey.app/u/Blooddrunk)\ **Post date:** [April 5, 2026, 7:46pm UTC](https://community.homey.app/t/app-pro-viessmann-app-for-homey-pro/116744/322 "2026-04-05T19:46:18Z")
Hello, any idea why it does not show any data? Thanks in advance. ![IMG_3644](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/1/3/13a063da6abdac4a3e8e0773484a37036899589b.jpeg) ![IMG_3645](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/8/5/85c47e46089ed2dfa41e93c3a092e694136f93e1.jpeg) ---
**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:** [April 6, 2026, 4:18am UTC](https://community.homey.app/t/app-pro-viessmann-app-for-homey-pro/116744/323 "2026-04-06T04:18:40Z")
Hey @Blooddrunk Not really, could you send me a diagnostics report? ---
**Author:** ![Blooddrunk](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/blooddrunk/32/82094_2.png) [@Blooddrunk](https://community.homey.app/u/Blooddrunk)\ **Post date:** [April 6, 2026, 7:34pm UTC](https://community.homey.app/t/app-pro-viessmann-app-for-homey-pro/116744/324 "2026-04-06T19:34:44Z")
Hello, It seems to be working fine again. I had to repair the device again. Anyway thanks for a quick reply! ---
**Author:** ![Thomas\_Brenac](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/thomas_brenac/32/121365_2.png) [@Thomas\_Brenac](https://community.homey.app/u/Thomas_Brenac)\ **Post date:** [April 12, 2026, 9:02pm UTC](https://community.homey.app/t/app-pro-viessmann-app-for-homey-pro/116744/325 "2026-04-12T21:02:31Z")
thanks. report: 375683d4-9137-4a91-8548-c991b74ae0fa [Previous page](https://community.homey.app/t/app-pro-viessmann-app-for-homey-pro/116744.md?page=15) [Next page](https://community.homey.app/t/app-pro-viessmann-app-for-homey-pro/116744.md?page=17)