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A.This is due to voltage variations which are common everywhere. Or altitude. Or even extreme humidity. Slight fluctuations in power which
occur everywhere do not have a noticeable effect on most appliances. They can slightly alter the cooking times in the crockpot due to the extended cooking times. Allow plenty of time, and remember, it is practically impossible to overcook. You will learn through experience whether to use the shorter or longer time given.

Q. "Must the crockpot  be covered? Is it necessary to stir?"

A.Cook with the cover on. Avoid frequent removal of the cover to check cooking progress or to stir.
Significant amounts of heat escape when lid is removed; therefore, the cooking time must be extended. The crockpot  lacks the ability to recover heat loses quickly when cooking on low setting. Never remove cover during first two hours when baking breads and cakes. It's not necessary to stir while cooking on low. While using high setting for short periods, occasional stirring improves the distribution of flavors throughout the recipe.

Q."How about thickening the juices or making gravy?"

A. Make it right in your crockpot  !!
Retain all that delicious flavor!! You may remove foods from the pot, leaving the juices. Prepare a smooth paste of about 1/2 cup flour or cornstarch to 1/2 cup water or 4 tablespoons melted butter. Pour mixture into liquid in the crockpot  and stir well. Turn to high; when it comes to a boil (about 15 minutes) it is ready.

Q."Can I cook a roast without adding water?"

A. Yes, if cooked on low. The more fat meat has, the less liquid you need. Liquid is needed to properly soften and cook vegetables.