Vaillant VSMART - Checking the battery charge condition

4 Operation
10 Operating instructions vSMART 0020212889_01
– The comfort protection mode is automatically de-
activated as soon as the Internet connection is re-
established.
4.8 Checking the battery charge condition
1
If the (1) symbol appears in the thermostat display, the
batteries are almost flat.
If the above display view appears on the thermostat, the bat-
teries are flat.
▶ Replace the batteries in the thermostat.