Webasto Air Top Evo 3900 Operating Instructions Manual page 7

Operation
Remote control
Main switch ON / OFF
Switching on the heater
By pressing the main switch ON / OFF the heater is activated.After
switching on, the main switch illuminates and the indicator "ON /
Status" lights to confirm the heater operation.
Switching off the heater
By pressing the main switch ON / OFF again the heater operation
is stopped.
After switching off, the lighting of the main switch is also off.
The indicator "ON / Status" goes off after approx. 3 minutes
(cooling down of the heater).
Mode selector knob
With the mode selector knob you can select the desired functions
of your heater by placing the index on the desired symbol.
Temperature selector
You can adjust the desired interior temperature with the
temperature selector.Preferably the temperature selector should
be in the marked range of the scale (comfort range).
Not available in U.S.