Do not pour more than 100 ml water in the water reservoir. Also, make sure that the steriliser is always placed on a level surface.
If your Philips Avent steriliser seems to be leaking, check the water level. You may have poured too much water in the steriliser.
Do not pour more than 100 ml water in the water reservoir. Also, make sure that the steriliser is always placed on a level surface.