Step 1: Remove the thermostat casing
- The release tab is located opposite the thermostat display. Press it very firmly with your thumb while simultaneously pulling the thermostat cover away from the valve and towards you.
- During this process, use your other hand to press on the Viessmann logo at the end of the thermostat to make it easier to remove the casing.
Step 2: Open the valve
- Press button A next to the display for at least 3 seconds until you feel a slight vibration. As soon as the display shows “- -”, the valve is open.
This makes it easier to remove the thermostat.
Step 3: Remove the thermostat
- Press the release tab again while simultaneously turning the thermostat anticlockwise.
- The thermostat is now detached from the adapter and can be removed.