UNIPRODO UNI HEATER 09 Manual De Instrucciones página 31

Press the function selection button (F) on the control panel to go to the airflow
settings option. The display will show the value "-" (see pictures below) and the
UNI_HEATER_09 model's fan indicator will light up (see the picture below on the
left):
Pressing the function selection button (F) again starts the heating at a low power
level, which is additionally indicated by the appropriate indicator on the control
panel in both models:
Pressing the function selection button (F) for the third time will increase the
heating power, which will also be signaled by an indicator on the control panel: