Loss of power >>> Test the mains outlet with a lamp known to be working.
Food cooked on wrong setting for cooking time >>> Check the control knob position and the recipe details.
Glass lid not placed correctly on the cooking pot >>> Check the glass lid is correctly placed and nothing is obstructing it.
Cooking pot was under half full >>>Your slow cooker has been designed to thoroughly cook food in a filled cooking pot. If the cooking pot is only half-filled, check to see if the food is cooked 1 to 2 hours earlier than the recipe time.
Food cooked too long >>> Check the control knob position and the recipe details.
Cooking pot placed in base unit while still very hot >>> Cooking time may be shortened. Check food is cooked 30 minutes to 1 hour earlier than the stated recipe time.