
Hans Testus
App doesn't support switch of language, always takes the device language with no option to configure. standard nowadays is that you can set this within the app settings of the Android system. Also missing: option to manually start heating, just like I can manually start hot water. At this time of the year, one doesn't need the heating all day, but sometimes just want to turn on the heating. Doesn't sound like an unusual request. But it's not possible, I have to change time plans...

Matthew Corum
I have spoke with customer service and went through all of their steps on the phone and no one could get it to connect to the app even though the wifi finds the boiler. Now 8 months later after various app updates, nothing is fixed and it still won't establish connection with the app. Always finds the boiler via wifi but the ViCare app will just say searching for device or whatever. This is probably the worst app I have dealt with with even cheap products having no problem pairing to an app.
7 people found this review helpful

Fred Llamedos
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worked fine for a while now says "no Internet connection" if I go to main unit it shows as fully connected to the internet with backend connected but app refuses to connect at all. update, supplied Viessmann with all details requested and... no reply, nothing nada. what a complete waste of time you lot are.
1 person found this review helpful
Viessmann IT Service GmbH
August 28, 2026
Hello Fred Llamedos. We apologize for the inconvenience. Please send a description of the issue, screenshots/photos, and the communication module’s serial number to customer-contact+FredLlamedos@viessmann-climatesolutions.com. This will help us assess the situation thoroughly and provide an appropriate resolution.