Remove the grill from corner to corner.

Carefully remove the screws and place them aside.

As seen in the pictures, set the screwdriver on the edge of the cover and pry it out.

Remove sticker in order to open the plastic casing of the heater.

Slowly and carefully pry the plastic casing.

Apply pressure onto the sides of the switch while pushing it outwards.

Unscrew the four screws located in the rear of the device. Remove the fan.