3.2. Description of the individual elements Operation 16. Control lamp: Fan reversal This control lamp goes on if you press the fan reversal switch and keep it pressed. As long as the control lamp is on, the fan wheel rotates in the opposite direction. Once you release the switch, the fan wheel rotates in the normal direction and the control light goes out. GK043111 3-12 WA100M-5 – VEAM280201