Several appliances rely on free flowing air or water to function properly. If your clothes dryer takes a long time to dry your clothes check your dryer vents. Make sure that the exhaust behind your dryer does not have the kinks in that the outdoor vent has no blockages and that the exhaust air is able to circulate freely. Dishwasher can often become in-operational due to clogged drains. Make sure that you regularly clean the drains of any debris. Check to see if there are any obstacles blocking the path of the spray arms. Clean your soap compartments once or twice a month and make sure that you load your dishwasher properly.
When it comes to refrigerators, one of the most important things you can do is to vacuum the dust on your refrigerator's condenser systems. Also, make sure that the cooling vents inside your refrigerator are not blocked by food or other items.
A lot of appliances have computerized controls that may need to be reset occasionally. It can help to unplug the unit from its power supply for several minutes in order to reset the computerized systems and then to plug it back in. If the problem persists, you may need to call for service.