This can occur when the battery has a very low charge. Please ensure that the handle is fully charged by making sure the charger is plugged into a live power outlet and placing the AirFloss on the charger for a full 24 hours. When the AirFloss is fully charged the green LEDs will illuminate and then go out after 10 minutes. This indicates that the AirFloss is fully charged. If the product continues to display a flashing yellow light after going through the process of charging for a full 24 hours, contact Philips Support.
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