This can be caused by excess moisture in food placed in the device (e.g., leftover meals in sauce, watermelons, cucumbers, oranges, any other whole fruit or vegetable).
To avoid this problem, avoid adding liquid items and avoid exceeding the maximum fill line. In exceptional cases, an 8-hour cycle may be too short to process all the food if the bucket is too full. In this case, it is possible to start a second cycle with these foods to complete the processing.
If this happens regularly, it can be caused by a problem with the device’s ventilation or temperature. Check if heat is released above the appliance. If not, contact Tero Technical Support.