The capsule may be empty. Insert the capsule in the diffuser again and look at the screen display. If the capsule is empty, the message “CAPS OVER” is displayed. It's time to change the capsule.
Is the capsule inserted correctly in the diffuser? Insert the capsule again and check that the luminous halo lights up when inserting.
Diffusion mode may not be on. On the screen, check that the symbol or is on. Check that the symbol is on at the time of expected diffusion.
It is possible that the fan is not working. Check that the blades of the fan are rotating through the grid at the back during diffusion = when the symbol is on. Put your hand in front of the grid on the front to feel the air flow.
It is possible that the scent sealing system is blocked. In sleep mode: wait for the scent sealing system to be released, which takes around two minutes. Then, in wake-up mode, put your hand in front of the grid on the front to feel an air flow when the symbol is on.
Did you put the diffuser close to your bed and at head height? Opposite you? Note that diffusion takes a few seconds and then becomes more intense. You need to wait 30 seconds to start to smell the fragrance and allow it to diffuse through the air. It is not as instantaneous as the sound or the light.
Recommendation: The air flow can reach 1.5 metres in three minutes.