Yeah I thought it had a seperate button (A) for the lights but the button seems to do a lot of other crap so that's probably the issue:
A) ON/OFF - lamps. This button is also used for the alarm function of the anti-grease and charcoal filters. Filter alarm: After 30h of motor operation, the L1 RED LED comes ON and remains ON for 30" (the grease filters have to be cleaned). After 120h of motor operation, the L1 RED LED comes ON and flashes for 30" (the charcoal filters have to be changed if the hood is so equipped). The Filter Alarm is ONLY given with the motor is OFF. The Filter Alarm is cancelled (HOUR meter reset) by holding down button A for 2".
B) Press button B to start the motor at Speed 1. The speed is shown by the L1 GREEN LED coming ON. When held down for 2", the motor switches off. A single pressure on the button when the LED is ON activates the timer function (motor ON for 5'), shown by the flashing LED. To cancel the timer function, press the button again.
C) Press button C to start the motor at Speed 2. The speed is shown by the L2 GREEN LED coming ON. A single pressure on the button when the led is on activates the timer function (motor on for 5'), shown by the flashing LED. To cancel the timer function, press the button again.
D) Press button D to start the motor at Speed 3. The speed is shown by the L3 GREEN LED coming ON. A single pressure on the button when the led is on activates the timer function (motor on for 5'), shown by the flashing LED. To cancel the timer function, press the button again.
E) Press button E to start the motor at Speed 4. The speed is shown by the L4 GREEN LED coming ON. A single pressure on the button when the led is on activates the timer function (motor on for 5'), shown by the flashing LED. To cancel the timer function, press the button again.