The simple reverse switch changes the direction of the fan blades drawing air in or out of the vehicle.
Fantastic fan rain sensor override.
If yours doesnt work that way and youre still under warranty have newmar fix it.
Some do and some do not.
Realizing that the fantastic fans are basically worthless because the rain sensor overrides the fan operation i disabled all three fan rain sensors by cutting the wires running from the rain sensor to the fan circuit board.
If out of warranty call fantastic fan.
Push and hold the up down button for a few seconds red light comes on rain sensor disabled.
Below are four photos showing how to disable the rain sensor.
Depends upon the model.
Now all fans are working properly.
Push and hold the up down button again red light goes out sensor is reenabled.
This model comes with a rain sensor that automatically closes the dome when wet.