Viessmann VITOWELL EASY D1, Operation Manual, Page: 11 / 20

Test Operation
DEMO FUNCTION
Press and hold M1, UP, DOWN at the
same time, buzzer will buzz twice to
indicate DEMO mode has successfully
activated.
Demo mode
Icon will display “V0” version code
for 1 second, temperature display will
show cold water “ ” next, 32ºC will
keep rising by 1ºC until it reaches 45ºC.
If Demo mode does not exit, buzzer will
buzz once and repeat the above
display.
Press and hold M1, UP, DOWN again,
buzzer will buzz twice to exit DEMO
mode.
During DEMO mode, all operations are
invalid. Reconnecting power supply
can exit DEMO function.
Outlet water temperature display
function
This heater is able to show actual
temperature.
While heater is working, press and hold
“M1, M2, UP” button together, buzzer
will buzz twice, after 3 seconds the
thermistor actual temperature will show
on temperature display.
Switch off water to exit or press and
hold “M1, M2, UP” button all together to
exit.