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FAQ about the ViCare app

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How does the ViCare app work? What does it allow me to do and what functions does it have? How do I install the app correctly? You can find the answers below, together with useful information on the most frequently asked questions about the ViCare app.


The complete list of heating systems is divided into two categories, depending on whether or not a system has a built-in WiFi module. Newer Viessmann devices with WLAN on board (so-called "One Base" systems) can connect directly to the Viessmann cloud and be controlled via the ViCare app. Older devices require a Viessmann Vitoconnect internet gateway.  Please contact your heating engineer if you are unsure of the correct solution.

The following is a list of older-generation heating systems that work with ViCare devices in combination with a Viessmann Vitoconnect OPTO2:


  • Vitocal 200-S, type: WO1A, WO1B, WO1C
  • Vitocal 222, type: WO1A, WO1B
  • Vitocal 222-G, type: WO1C
  • Vitocal 222-S, type: WO1C
  • Vitocal 242-G, type: WO1A, WO1B, WO1C
  • Vitocal 242-S, type: WO1C
  • Vitocal 333, type: WO1A, WO1B
  • Vitocal 333-G, type: WO1C
  • Vitocal 343-G, type: WO1A, WO1B, WO1C
  • Vitocal 3xx-A, type: WO1A, WO1B
  • Vitocal xxx-A, type: WO1C
  • Vitocal xxx-G, type: WO1C


  • Vitocrossal 300, type: HO1A, KW6B
  • Vitocrossal 300, model: CU3A, type: KW6B


  • Vitodens 200, type: HO1B, HO2B, HO2C  
  • Vitodens 200-W, type: HO1, HO1A, HO1B
  • Vitodens 222-F, type: HO1A, HO1B
  • Vitodens 242-F, type: HO1A, HO1B
  • Vitodens 2xx-F, model: B2HA, B2KA, B2LA, B2TA, B2SA, type: HO1B
  • Vitodens 2xx-W, model: B2HA, B2KA, B2LA, B2TA, B2SA, type: HO1B
  • Vitodens 300-W, type: HO1, HO1A, HO1B, HO1C, HO2B, HO2C
  • Vitodens 333-F, type: HO1, HO1A, HO1B, HO1C, HO2B, HO2C
  • Vitodens 343-F, type: HO1A, HO1B, HO1C, HO2B, HO2C


  • Vitola 100, type: KW1, KW2
  • Vitola 200, type: KO1B


  • Vitoladens 300-C, type: HO1A, HO1B, KW6B
  • Vitoladens 300-T, type: KO1B
  • Vitoladens 300-W, type: HO1, HO1B
  • Vitoladens 333-F, type: HO1A, HO1B


  • Vitoligno 200-S Ecotronic v2.03+
  • Vitoligno 250-F Ecotronic v2.00+
  • Vitoligno 250-S Ecotronic v2.00+
  • Vitoligno 300-C Ecotronic v2.12+
  • Vitoligno 300-H Ecotronic
  • Vitoligno 300-S Ecotronic v2.04+
  • Vitoligno 300-P, type: F01


  • Vitorondens 200-T, type: KO2B
  • Vitorondens 222-F, type: KO2B


  • Vitocaldens 222-F, type: WO1C
  • Vitogas 200-F, type: KO1B, KO2B
  • Vitopend 200-W, type: HO1, HO1A, HO1B
  • Vitoplus 300, type: HO1
  • Vitosolar 300-F, type: HO1C
  • Vitosorp 200-F

Installing and registering

Follow the steps below to connect the Viessmann heating system to the ViCare app:

  1. Download the ViCare app (iOS or Android).
  2. Follow the instructions in the ViCare app.

To register, create a user account in the app under the item "Create new account". To set up your account, you will need to provide the following information:

  • First name and surname  
  • Address  
  • Telephone

You must also give the location of your heating system if it differs from your address. This information helps the contractor find your exact address after the service clearance. Finally, you should accept the privacy policy and terms of use to complete the process. You have now configured the ViCare app.

You can download the ViCare app from the App Store or the Google Play Store. Observe the minimum requirements for your operating system.

ViCare is a native app, i.e. developed for a mobile operating system. A PC version is currently not available.

The Vitoconnect module can be easily registered via plug & play. All you need to do is scan the provided QR code with your smartphone. When you do this, make sure the heating system's Vitoconnect and Vitotronic control unit are connected to power and the internet using the cable supplied. Scanning the code connects the Vitoconnect to your account in the ViCare app. To do this, you must download the app and create a user account there.

Simply download the ViCare app to your new device. Then log in with your email address and password. You do not need to create a new account or re-configure the app. Once you have logged in, you can continue to use the services of the ViCare app.

For safety, the Vitoconnect is permanently connected to the control unit of the corresponding heating system. Before you buy a new Viessmann heating system, the Vitoconnect must be reset. To do this, send an email to the following address: This should be done from the address with which you registered your Vitoconnect. Then install the Vitoconnect and connect it to the new heating system.

The QR code is also attached to the Vitoconnect enclosure, directly on the circuit board. Disconnect the power and USB cables from the Vitoconnect and take off the enclosure cover. The best way to do this is to pull the enclosure towards you at the bottom and then lift it off. For detailed information, see step 1 in the PDF file "Commissioning".

Basically, the operating system, i.e. the ViCare app, reports when and which updates are available. You must confirm this notification then download and install the updates. With the appropriate setting on your smartphone, updates can be downloaded automatically.

Any available extensions will be installed with the app updates. You should therefore always keep the app up to date. After each update, a notification will tell you what is new and what has changed.

Download the ViCare app

Make your heating smart with ViCare. Enjoy perfect warmth and the reassurance that comes with knowing what's going on.


There are a number of benefits to connecting your Viessmann heating system to the internet, controlling it with the ViCare app and viewing your consumption data.

  • Comfort
  • Updates
  • Security
  • Guarantee

In addition, once you have connected your heating system, you also have the option of extending your guarantee from two to five years. To ensure that the guarantee extension remains valid, your heating system must stay online and connected for the entire period.

Read below to find out more about connectivity in your home and your Viessmann system.

  1. Download the ViCare app for your iOS or Android device.
  2. Set up your ViCare account.
  3. Scan the QR code of your heating appliance.

Tip: Make sure that you enter the correct email address to log in to the ViCare app and update your password at least every six months.

  • The WiFi router must be protected by a sufficiently secure WPA2 password, which must be min. 8 and max. 63 characters long.
  • Make sure that the WiFi router always has the latest firmware update.
  • The connection between the heat generator and WiFi router should not be unencrypted.
  • Use an internet connection with high availability, preferably on a flat-rate tariff (with no time or data volume restrictions).
  • The frequency of your WiFi signal should be 2.4 GHz for the best connection.
  • DHCP (dynamic IP addressing) must be activated.

Routing and security parameters must be set in the IP network (LAN).

  • For direct outgoing connections, enable the following ports:
    • Port 80
    • Port 123
    • Port 443
    • Port 8883

Please note: If you are not familiar with this process, it may be advisable to consult an IT expert who can help you with the setup.

  • Make sure that you have a stable internet connection from your internet service provider.
  • If you have recently changed your provider and/or router, reset the connection.
  • Check the signal strength in the ViCare app (Settings -> Devices -> Communication module)
  • If you have an older generation Viessmann heating appliance with the external Vitoconnect communication module, try to position it somewhere with a stronger signal. If you need to pair the devices again, scroll down to the section "Vitoconnect pairing"
  • In the "Notifications" area in ViCare, you can check whether Viessmann is currently performing maintenance work or whether the system is being restored after a temporary outage.
  • If these tips do not help or the signal strength is very low, restart your communication module. You can carry out the restart via Settings > Devices > Communication module.
  • If the router is located some distance from your heating system, it is possible to install a WiFi signal booster in your home
  • If you have individual room control, installing a ViCare repeater may improve communications between the devices.

To reconnect the app to the Vitoconnect, following these steps:

  1. First, press the reset button on the Vitoconnect for a few seconds.
  2. Update your WiFi settings in the ViCare app: Settings > Devices > Communication module > Network settings
  3. The app prompts for the serial number. The easiest way to enter this is to scan the QR code enclosed with your Vitoconnect.
  4. The application is now ready for use.

If these steps do not solve your connection problems, read further articles in our FAQ or contact the Viessmann Community for further support.

Operation and function

You can find all information on the functions and on operating the ViCare app on the ViCare app page or at your local Viessmann trade partner.

In addition to the heating circuit temperatures, you can view the DHW and outside temperatures. All available information is presented in a clear tile view. The heating modes are also indicated.

The time program is shown as a calendar with a clock and when you are at home, a house symbol is displayed.

For more information, visit the Viessmann ViCare app page.

You can set both Comfort and Party mode using the ViCare app. This lets you conveniently balance demand and performance. You can set these options with both Android and iOS devices.

Economy mode can only be set if your heating system control unit supports this function. Otherwise, you cannot make these settings via the app.

Error messages and faults

If the ViCare app will not connect to the heating system, check if there is an internet connection.

Fully close the app. If you have an Apple product, double-press the Home button and swipe the app upwards to close it. Then restart the app. The ViCare app should now work again. To be on the safe side, also check the  App Store  or  Play Store  for updates to ViCare. Also make sure that your operating system meets the minimum requirements. Specifically, this means iOS 10.3 or Android 4.4 upwards.

If the faults recur in the app itself, contact If the faults occur in the heating system, contact a Viessmann trade partner or your trusted heating contractor.

The ViCare app only displays the outside temperature if the heating controller has this function. This means that the outside temperature is only available if the heating system is weather-compensated and equipped with an outside temperature sensor.

Currently, the ViCare app does not support flow temperature indication.

To find the boiler water temperature, go to the "Settings" menu point, scroll down to "Devices" and tap "Boiler". The boiler water temperature is indicated for all oil and gas heating systems.

On the start screen of the ViCare app, there is a "Forgot password" function. Enter the email address you registered with. You will then receive an email with which you can assign a new password.

Check the position of your router and check all connection cables.  

If both of these are okay, install a WiFi repeater to amplify your WiFi signal. This should give you a stable connection between your smartphone and the heating system.

The actual temperature is only displayed if the app receives this data from the heating system. For this, the heating control unit must be equipped with the required function. If you have not installed a room thermometer, such as a remote control, there is no data for it and the app displays "--".


We are a family business with more than 100 years of history and the highest quality standards. We consider ourselves to be a reliable partner in the lives of our customers. Transparent handling of your data is a central part of this reliability.

  • Security: We constantly review our systems to ensure the highest level of data security for our users. We work in accordance with the GDPR and our data communication systems are VDE-certified.  

  • Servers: Our servers are located in the EU. Your data will be treated confidentially and will only be accessible to you and, if applicable, your trade partner if you have placed an online service order with them.  

  • Quality: Our high Viessmann standards also apply to our digital products. In addition, we unfailingly adhere to industry best practices.    

Where can I find Viessmann's legal notice?

You can view our legal notice at any time here:

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