Hello julius_gin, I have just managed to get this resolved for my 111-w installation. Yes, it reports as a connectivity issue, but viessman technical walked me through this procedure: 1) make sure you have good reception for the boiler, climate sensor and vicare app (I moved a wifi repeater in to the room with the boiler, and also the sensor and my mobile) 2) take the climate sensor and on the back hold the recessed reset button in for 10 seconds until it flashes red on the front to reset it 3) wait a little while, then press the reset button 5 times (can be done quickly). It should flash green and red on the front. 4) In the vicare app go to add component, add climate control, scan the code on the back. Should then go through pairing and complete. 5) Check vicare app to see if the sensor is showing up properly - should be able to see the sensor temp, battery and signal strength. 5) If still not working, take the battery out of the climate sensor for 20 seconds, and then replace it 6) Come out of vicare app and go back in. You should be able to see the climate sensor temp, battery and signal strength. The 574 error stops displaying on the boiler automatically when the connection with the climate sensor is connected properly, you don't have to clear it on the panel. Hope this helps.
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