Ultrasonic Humidifier

My Philips Avent humidifier produces an unpleasant smell

The Avent humidifier doesn't work even though the power light is on

My Avent humidifier doesn't produce mist when the power light is on and the fan is working

My Philips Avent humidifier doesn't produce enough mist

My Philips Avent humidifier makes strange noises